Possible Agents not recognized

[Robyn Davey]

Hi,
 
I'm working in a 4.5B system.  I've defined the 'Possible Agents' of a task as a
security 'Activity Group'.  When I trigger the workflow, all work item runtime
reports indicate that the proper selected agent (derived via role resolution)
has been determined from the correct pool of possible agents.  The selected
agent receives the work item in their inbox.  However, when they attempt to
execute the work item, they receive the error:
 
WL844:  Work Item xxx: User XXXX cannot reserve the work item.     (Note:  I
have been refreshing the org environment!)
 
I have found the root of the problem to be the Possible Agents definition.  If I
change the configuration from Activity Group to a General Task, the task can be
executed successfully in the Inbox.   (Not to mention that if I change the
configuration back to Activity Group - it now works, i.e. no consistency).
 
We also have a 4.0B training system that we applied 13 4.0B hot packages.  We
have a similar configuration with the Possible Agents defined as an HR
Organizational Unit and the Selected Agents derived using Role Resolution.  We
have encountered the same error.  The problem is random and intermittent - not
all students encounter the problem.  It almost appears that one of those hot
packages has the bug in it.
 
Has anyone else experienced this situation?
 
Thanks in advance.
 
Robyn Davey