Enqueue Errors - ECC 6.0
Florin Wach
florin.wach at gmx.net
Tue Mar 2 05:13:35 EST 2010
yeah, I find these work items completed afterwards, when the report RSWWERRE ran.
That behaviour seems to be typical, when using a parallel branch, where on one thread a work items is in process (and currently locked by the user) and the other thread ends the whole thing but cannot change the workitem's status.
In such cases it's better to create a terminating event for the work item, instead of ending it through a second brach.
Bw,
Florin
-------- Original-Nachricht --------
> Datum: Tue, 2 Mar 2010 02:59:19 -0700
> Von: "Catherall, Andy" <andy.m.catherall at cadbury.com>
> An: "SAP Workflow Users\' Group" <sap-wug at mit.edu>
> Betreff: RE: Enqueue Errors - ECC 6.0
> I have come up with an interesting problem whilst testing my L3 lock
> solution:
>
> Whilst my workflow has 'correctly' responded to the event... the
> WAIT-FOR-EVENT has fired, the fork and loops etc have ended. The
> workflow has been set to COMPLETED... but...
>
> I still have work items in a terminated branch of the terminated fork in
> a state of 'In process' - ok, in part, this is possible as I was
> executing the work item when the event was fired off. The workflow
> cannot end that work item...but of much greater concern, when I process
> these to completion, the workflow will spawn the next work item!!...and
> the next, and the next...
>
> In a COMPLETED fork. In a COMPLETED workflow.
>
> Anyone come across that before?
>
> An OSS is in progress.
>
> Thanks
> Andy
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Catherall, Andy
> Sent: Thursday 25 February 2010 17:44
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
>
> All
>
> An update on an ancient thread.
>
> I had opportunity to talk to an SAP webflow developer the other week (ie
> someone who builds the actual webflow engine) and got some insights into
> the enqueue issue.
>
> To summarise my problem:
> In the move from 4.6c to ECC6, workflows appear to have lost a degree of
> their 'event handling' abilities. Yes, we can capture events all over
> the place now; and we can raise local events too.. but, the enhanced
> enqueing means that a workflow will not necessarily respond to that
> event at the time that it is raised.
> This might be due to the workflow being locked to activities going on in
> other branches of a fork, for example.
>
> Worse, it will not necessarily then respond to that event at the
> earliest possible opportunity after the event has been raised. You might
> expect that when the work item [that was locking the workflow]
> completed, the webflow engine would review the overall status of the
> workflow before the next step was started, and recognise that an
> applicable event had been received elsewhere in the workflow, and
> therefore not move on to the next step. But it does not do this.
>
> Instead, we have to wait for RSWWERRE to run, periodically, and try to
> re-present the event every so often. If the workflow is busy again, the
> event is put back on the queue for later. In the meantime, the rest of
> the workflow can merrily continue, oblivious to the event effectively
> knocking at its door.
>
> Instead of the workflow using the event as an interrupt, so that it
> responds in a timely manner to activities that are going on within the
> wider SAP system, the 'event' has become a rather ineffective, delayed,
> tool, which cannot be relied upon to ensure that no-longer-relevant
> steps are not shown to users.
>
> This particular issue was having quite an effect on a number of my
> workflows that rely upon events to guide their behaviour. Whilst I'm
> not out of the woods yet, I have made some progress.
>
> The lesson
> The lesson I received, then, was with respect to the various settings,
> on the 'Locking Properties' tab, on the 'Control' tab, of the 'Version
> Dependent' tab(!), of the workflow header. I have struggled to find
> information on what the various options do.
> The great lesson was that the 'old' 4.6c way of operating is effectively
> embodied in L3. This will cause the lock to be taken only at the point
> where the step is transitioning to or from the workflow - at the point
> where the containers are being updated, for example. This means that a
> wait-for-event step can now respond to the event, and can now updated
> the workflow that it lives in. It can now cause the fork & the workflow
> to complete! Fantastic.
>
> The L2 and L1 options are similar, but only cause the locks to be
> released during tasks of type W and B, as applicable.
>
> Testing continues, but I thought I'd share this.
>
> Thanks
> Andy
>
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Catherall, Andy M
> Sent: Friday 14 November 2008 15:47
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
>
> Hi Sue
>
> Thanks for the info. Can I just check some aspects, as what I am seeing
> seems subtly different.
>
> 1) The main fork has a couple of dialog tasks. However, the other branch
> of the fork only has a 'wait-for-event' followed by a background-step,
> not a dialog task.
> 2) The error in the log is being reported against the 'wait for event'
> step. It is failing to complete due to us having a lock on the workflow.
> 3) The next step to be created is the subsequent dialog step in the main
> fork. Following the thread below, we turned off 'Advance with dialog'
> days ago.
> 4) Whilst the workflow at large, and even the WFE work item, do not go
> into error, several moments (sometimes over an hour) later, the WFE
> finally completes and the fork terminates. We suspect the 'reprocess
> errored workitems' job, but the varying delay has us confused.
>
> We've run several tests around this, and it seems to be consistently the
> case that a 'wait for event' cannot respond to an event if a user
> happens to still be in the work item (which, as this is now a racing
> issue, may well be the case).
>
> This seems to be a major flaw, but I guess there must be some
> alternative approach, as the community at large does not appear to be
> making much noise about this. Are we being forced down the route of
> capturing events at the WF header level? Does this even work, if the
> workflow is still locked anyway?
>
> Our next test is to see if the WFE completes when it is the only task in
> a subflow (and that subflow positioned in place of the WFE in the fork).
> It seems rather bizarre if this approach works!
>
>
> Thanks for any advice anyone can give, and have a good weekend!
>
> Cheers
> Andy
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Sue Doughty
> Sent: Wednesday 12 November 2008 14:44
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
>
>
> Hi Andy,
>
>
>
> You can only have one dialog task in one path of a fork. What we had to
> do was to create sub-workflows for all but one of the dialog tasks in
> the fork. That was a big project to go into all workflows and make that
> change.
>
>
>
> The waiting on events in parallel forks will work....you just cannot
> have a dialog task under the wait step. If you make your dialog task
> underneath the event a sub-workflow, then your events will work fine.
>
>
>
> SAP was adamant that it was working as designed and would not consider
> modifying it.
>
>
>
> Regards,
>
> Sue T. Doughty
>
> SAP Workflow Specialist
>
> Old Dominion Freight Line, Inc.
>
> 500 Old Dominion Way
>
> Thomasville, NC 27360
>
> Phone: (336) 822-5189
>
> Toll Free (800 ) 432-6335, ext. 5189
>
> Email: sue.doughty at odfl.com
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Catherall, Andy M
> Sent: Wednesday, November 12, 2008 6:36 AM
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
>
>
> All
>
>
>
> Context
>
> -----------
>
> We have recently started making changes to a workflow in ECC6. The
> original design existed in our 4.6c system and has worked for years. As
> the SAP instance was upgraded, the workflow remained. We have then
> copied this workflow in ECC6, and are developing on the copy. The
> workflow handles parked MM invoices.
>
>
>
> Issue
>
> --------
>
> This workflow has a main fork, and two parallel forks. These parallel
> forks handle the BUS2081-POSTED and BUS2081-DELETED events. The main
> fork allows the user the opportunity to resolve the issues with the
> invoice and Post it (if complete) or save it (if still awaiting more
> information). There is an 'advance with dialog' step immediately after
> the invoice edit step, which raises a pop-up to confirm with the user
> that they *did* mean "save", didn't they...?
>
>
>
> Of course, if they selected "POST", we are expecting the posted event to
> be raised (which it is), and for the other fork of the workflow to kick
> in (as it used to do), and for some tidy-up and completion to occur
> (which is not happening due to the locked workflow), and hence for our
> main fork to be terminated as the workflow ends (but, as it is not
> ending, the main fork continues...).
>
>
>
> Based on the conversations below, it sounds like there is a fundamental
> design paradigm shift - we can't have parallel forks waiting to respond
> to event based on the users' actions, because the main fork will have
> locked the workflow anyway. I take it this can't also be true for the
> 'new' header-level event handling??
>
>
>
> Given that the discussion below occured several months ago, has the
> debate or approach moved on? Is there now an updated view regarding
> 'best practice' design for this sort of functionality?
>
>
>
> Many thanks
>
> Andy
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Sue Doughty
> Sent: Tuesday 25 March 2008 13:07
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
> We are on ECC 6.0. I have a new issue with the Enqueue errors.
>
>
>
> We have workflows using Webservice to pass around a form via workflow
> for approval and processing. After the form has been processed, I have
> a notification fork which sends a workflow (via a sub-workflow) with a
> copy of the form that certain departments need to view - it could be one
> or up to four sub-workflows. Also in the fork is a background process
> (via a sub-workflow) that checks the TOA01 table (via a method in the
> BUS1065 BO) to insure that the image was stored with the employee
> record. The first step waits for 30 seconds and then checks every 10
> minutes for 30 minutes before sending a notification to the Workflow
> group if it fails to find it.
>
>
>
> The problem is that as soon as the sub-workflow for the checking of the
> TOA01 table starts, all of the other sub-workflows in the fork will not
> continue until that sub-workflow finishes. I get an error that the work
> item number of the main workflow (top level) is locked by user WF-BATCH
> (enqueue error).
>
>
>
> I thought that as long as I was executing sub-workflows, I would not get
> the enqueue errors. Am I missing something?
>
>
>
> Regards,
>
> Sue T. Doughty
>
> SAP Workflow Specialist
>
> Old Dominion Freight Line, Inc.
>
> 500 Old Dominion Way
>
> Thomasville, NC 27360
>
> Phone: (336) 822-5189
>
> Toll Free (800 ) 432-6335, ext. 5189
>
> Email: sue.doughty at odfl.com
>
> ________________________________
>
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Sue Doughty
> Sent: Tuesday, October 23, 2007 10:11 AM
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
>
>
> Hi Mike,
>
> I've moved two of the three decisions and the call to PA40 into a sub
> workflow and now all three branches of the fork can now be completed.
>
> I replied back to OSS stating that I felt like it was not working
> correctly and this is their response.....they will NOT do anything about
> it and suggested, as you did, to do sub workflows:
>
> thank for your response as well, and of course your valuable input
>
> is always appreciated. Nevertheless we have now reached a level,
>
> where you put into question the fundamental design / architecture
>
> of the workflow runtime system.
>
> An important feature of the workflow runtime system are so-called
>
> "synchronous process chains" (advance with dialog), i.e. if there
>
> is a sequence of dialog steps to be processed by the same user,
>
> they are executed as one chain without going to the inbox in between.
>
> A pre-requiste for this is the lock on the father workflow during
>
> the entire process chain.
>
> workflow F_______________________________
>
> ^ | ^ | ^
>
> | | | | |
>
> task ___W1___| v___W2___| v___W2___|
>
> ----------------------------------------------> time
>
> In your case there are two of such process chains, which collide
>
> because they are in parallel branches of a fork.
>
> I talked again to my boss, who is not only development manager
>
> but in this case also the responsible developer. He definitely
>
> sees no room for tolerance here.
>
> On the other side there should be a workaround by embedding the
>
> individual branches into subflows, because only the direct father
>
> and not the top-level workflow is locked. Hope this helps.
>
> Mike, I really appreciate your help in this!!
>
> Regards,
>
> Sue T. Doughty
>
> SAP Workflow Specialist
>
> OLD DOMINION FREIGHT LINE, INC.
>
> 500 Old Dominion Way, Thomasville, NC 27360
>
> Toll Free :(800)432-6335, ext.5189
>
> Phone :(336)822-5189 Fax :(336)822-5149
>
> sue.doughty at odfl.com
>
> -----Original Message-----
> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On Behalf
> Of Mike Pokraka
> Sent: Tuesday, October 23, 2007 9:47 AM
> To: SAP Workflow Users' Group
> Subject: RE: Enqueue Errors - ECC 6.0
>
> OK, as I understand it:
>
> User A in one branch executes a decision and is advanced to the next
> step,
>
> which is a transaction.
>
> Before user A completes the txn, user B executes a decision in another
>
> branch followed by another unrelated action. This fails because user A
> has
>
> locked the WF.
>
> If I've understood this correctly then I'd call that a big fat bug. I
>
> would suggest replicating this in a test WF in it's simplest form - does
>
> it do the same without the decisions (i.e. just two PA40's in parallel
>
> branches)? What if you use transactions other than PA40 in both
> branches?
>
> Simplify as far as possible and send it back to OSS. (and let us know
> the
>
> outcome).
>
> Cheers,
>
> Mike
>
>
>
> On Tue, October 23, 2007 12:36 pm, Sue Doughty wrote:
>
> > Hi Mike,
>
> >
>
> > Thanks for your response.
>
> >
>
> > It is a standard call to PA40.
>
> >
>
> > Hi Mike,
>
> >
>
> > Thank you for your response.
>
> >
>
> > It is a standard call to PA40.
>
> >
>
> > I agree...a task should NOT lock the TOP level workflow.
>
> >
>
> > I did what you said and got the PA40 up and then tried to execute
>
> > another branch doing something different. It still locks the workflow
>
> > at the top level.
>
> >
>
> > I will try moving the decisions out into the sub workflow and see if
>
> > that changes things.
>
> >
>
> > Regards,
>
> > Sue T. Doughty
>
> > SAP Workflow Specialist
>
> > OLD DOMINION FREIGHT LINE, INC.
>
> > 500 Old Dominion Way, Thomasville, NC 27360
>
> > Toll Free :(800)432-6335, ext.5189
>
> > Phone :(336)822-5189 Fax :(336)822-5149
>
> > sue.doughty at odfl.com
>
> > -----Original Message-----
>
> > From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On
> Behalf
>
> > Of Mike Pokraka
>
> > Sent: Tuesday, October 23, 2007 4:46 AM
>
> > To: SAP Workflow Users' Group
>
> > Subject: RE: Enqueue Errors - ECC 6.0
>
> >
>
> > Hi Sue,
>
> >
>
> > OK, so that changes the picture a little. Regarding subWF, you should
>
> > try
>
> > putting the entire user dialog chain into the subwf - i.e. the
> decision
>
> > and the PA40.
>
> >
>
> > I've had similar probs where a lock would cause a similar error and
> the
>
> > error monitoring job would pick it up - as per the OSS response.
> However
>
> > I
>
> > am also not convinced this is right. Is this s standard "Call
>
> > transaction
>
> > PA40" type of method or does the code do something strange?
>
> >
>
> > A task should NOT lock the top level workflow. That defeats the whole
>
> > point of parallel execution. Yes there can problems if you and up with
>
> > two
>
> > branches joining at the same time and racing for the next step but a
> WF
>
> > should definitively be able to execute two steps in parallel otherwise
>
> > we
>
> > can all go home. Here's another test: when one user locks PA40, try to
>
> > execute something else in the other branch after the decision - or a
>
> > PA40
>
> > on a different employee - in other words something that works. If that
>
> > also fails then I say it's rubbish design that needs to be fixed.
>
> >
>
> > Cheers,
>
> > Mike
>
> >
>
> >
>
> > On Mon, October 22, 2007 9:10 pm, Sue Doughty wrote:
>
> >> Hi Mike,
>
> >>
>
> >> I changed the PA40s to subworkflows.
>
> >>
>
> >> I executed the workflow again and tried to execute the decision tasks
>
> >> (which call the PA40 subworkflow).
>
> >>
>
> >> It is still giving me an enqueue error on the Decision step at the
>
> >> INSTANCE level if more than one fork is executed at a time. It seems
>
> >> like it is telling me that only one path of the fork can be executed
>
> > at
>
> >> a time. If two people try to execute two different paths, it will
> get
>
> > a
>
> >> locking error. It is two difference paths of a fork and two separate
>
> >> decision steps.
>
> >>
>
> >> This can't be the way it is supposed to work!
>
> >>
>
> >> Regards,
>
> >> Sue T. Doughty
>
> >> SAP Workflow Specialist
>
> >> OLD DOMINION FREIGHT LINE, INC.
>
> >> 500 Old Dominion Way, Thomasville, NC 27360
>
> >> Toll Free :(800)432-6335, ext.5189
>
> >> Phone :(336)822-5189 Fax :(336)822-5149
>
> >> sue.doughty at odfl.com
>
> >>
>
> >> -----Original Message-----
>
> >> From: Sue Doughty
>
> >> Sent: Monday, October 22, 2007 11:28 AM
>
> >> To: 'SAP Workflow Users' Group'
>
> >> Subject: RE: Enqueue Errors - ECC 6.0
>
> >>
>
> >> Hi Mike,
>
> >>
>
> >> Thanks for responding.
>
> >>
>
> >> There is a decision task. They can click to print forms or if they
>
> > want
>
> >> to do the action in PA40, they click "Execute Payroll (or whatever)
>
> >> followup action". The task that gets executed is a call to PA40.
>
> >>
>
> >>
>
> >> Regards,
>
> >> Sue T. Doughty
>
> >> SAP Workflow Specialist
>
> >> OLD DOMINION FREIGHT LINE, INC.
>
> >> 500 Old Dominion Way, Thomasville, NC 27360
>
> >> Toll Free :(800)432-6335, ext.5189
>
> >> Phone :(336)822-5189 Fax :(336)822-5149
>
> >> sue.doughty at odfl.com
>
> >>
>
> >> -----Original Message-----
>
> >> From: sap-wug-bounces at mit.edu [mailto:sap-wug-bounces at mit.edu] On
>
> > Behalf
>
> >> Of Mike Pokraka
>
> >> Sent: Monday, October 22, 2007 9:39 AM
>
> >> To: SAP Workflow Users' Group
>
> >> Subject: Re: Enqueue Errors - ECC 6.0
>
> >>
>
> >> Hmmm, my first thougt was that this is complete nonsense from OSS.
>
> >> Then I notice that they talk about a decision task. So, now I think
>
> >> we're
>
> >> missing a piece of info here - is this a decision or a PA40?
>
> >>
>
> >> A possible workaround may be to put the PA40's into a subWF. It may
>
> > only
>
> >> lock the subworkflow. On the other hand it may also be a case of
>
> >> rejecting
>
> >> SAP's response - depending on this mystery decision task that is
> PA40.
>
> >>
>
> >> Cheers,
>
> >> Mike
>
> >>
>
> >>
>
> >> On Mon, October 22, 2007 1:26 pm, Sue Doughty wrote:
>
> >>> We are in the process of upgrading from 4.7 to ECC 6.0.
>
> >>>
>
> >>>
>
> >>>
>
> >>> We have a New Hire workflow that has a fork with three branches.
>
> > Each
>
> >>> branch goes to a different department and they all have a work item
>
> >> that
>
> >>> executes PA40 where they execute a specific action for the employee.
>
> >>>
>
> >>>
>
> >>>
>
> >>> In 4.7, if two departments happened to hit the same employee at the
>
> >> same
>
> >>> time, the second department trying to execute the work item would
> get
>
> >> an
>
> >>> error in PA40 - Employee is being processed by ######. They would
>
> >>> cancel out and come back later. The work item would remain in their
>
> >>> in-box.
>
> >>>
>
> >>>
>
> >>>
>
> >>>
>
> >>> In ECC 6.0, the workflow gets an ENQUEUE error - Error when loading
>
> >>> component: Work item 000000638111 locked (action FIND_FLOWITEM) and
>
> >> then
>
> >>> Work item 000000638111 locked by user E050889 (enqueue error)
> (action
>
> >>> FIND_BY_WIID_BY_WFM)
>
> >>>
>
> >>>
>
> >>> The error is referencing the Workflow INSTANCE, not the work item
>
> >> being
>
> >>> executed. The work item for the second user is then set to Complete
>
> > -
>
> >>> it never takes them to PA40. They have no way of going back in
> later
>
> >>> and executing the action.
>
> >>>
>
> >>>
>
> >>>
>
> >>> I opened a note with SAP and was told that it is working as
> designed.
>
> >>> See SAP's response below:
>
> >>>
>
> >>>
>
> >>>
>
> >>> Here the lock did not occur during work item execution, but after
>
> >>> execution during
>
> >>> the so-called "callback", because the corresponding workflow (father
>
> >>> work item) was locked. In such a case the work item (user decision)
>
> >>> is COMPLETED and the workflow is suspended. Especially the so-called
>
> >>> "synchronous process chain" (advance with dialog) is interrupted
>
> >>> unless SWWERRE puts the subsequent work item (PA40) into the inbox
>
> >>> of the user concerned.
>
> >>>
>
> >>> According to our development manager this works as designed.
>
> >>>
>
> >>>
>
> >>>
>
> >>>
>
> >>>
>
> >>> I am at a loss as to how to fix this problem. I don't want to take
>
> >> out
>
> >>> the fork and have the departments execute the PA40 action one after
>
> >> the
>
> >>> other. This would lengthen the time the workflow takes to get
>
> > someone
>
> >>> hired and I don't know which department I would do first....they all
>
> >> do
>
> >>> things in their own time.
>
> >>>
>
> >>>
>
> >>>
>
> >>> Has anyone else encountered this problem? Does anyone have any
>
> >>> suggestions?
>
> >>>
>
> >>>
>
> >>>
>
> >>> Any help would be greatly appreciated.
>
> >>>
>
> >>>
>
> >>>
>
> >>> Regards,
>
> >>>
>
> >>> Sue T. Doughty
>
> >>> SAP Workflow Specialist
>
> >>>
>
> >>> OLD DOMINION FREIGHT LINE, INC.
>
> >>>
>
> >>> 500 Old Dominion Way, Thomasville, NC 27360
>
> >>>
>
> >>> Toll Free :(800)432-6335, ext.5189
>
> >>> Phone :(336)822-5189 Fax :(336)822-5149
>
> >>> sue.doughty at odfl.com
>
> >>>
>
> >>>
>
> >>>
>
> >>>
>
> >>>
>
> >>> ****************************
>
> >>> CONFIDENTIALITY NOTICE: The information contained in this message
> may
>
> >> be
>
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> > --
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> > Mike Pokraka
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> --
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> Mike Pokraka
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> Senior Consultant
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> Mobile: +44(0)7786 910855
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