Problems with secondary methods (amodal method)

[Tor Magne Refsland]

Hi experts.
 
I am starting my WF through the SAP_WAPI_START_WORKFLOW in SE37.
 
My WF consistst of a decision step with a secondary method, amodal method, which calls a custom method (call_url).
 
The method call_url has been tested in SE80 and in WF with synchronous dialog chain(BMWP) where it works fine. 
 
Since UWL doesn`t support Synchronous dialog chain, I need to make a workaround.
 
 
Problem:
 
When I start the WF and enter MSS to open the workitem, I can see the attachment (call_url method). However, when I try to click on the link for the attachment (which is going to execute my custom method) I only get an errormessage.
 
The errormessage says: 
"An error has occured during calling attachment. Try again and inform the system administrator about this problem".
 
I have been checkin SU53, it is not an authorization issue.
 
I have been reading Gatlings blog about secondary methods and searching the web about the issue with no luck.
 
Any ideas how to solve it?
 
Thanks in advance.
 
Best regards,
 
Tor

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