Error using a standard role

["Lücking, Claus"]

Hi.
 
In a new workflow, I use a self-defined standard role of type
responsibilities, with Plant and MRP-controller as container elements.
Simulating the role works fine, but in the workflow I get this error:
 
Workflow no. 4462 step 129: Error or exception resolving role 'AC90000001'
 
    Message no. WL 423
 
Diagnosis
 
    The role function module for role 'AC90000001' initialized an exception
    and returned a message ("MESSAGE ... [RAISING ...]").
 
 
If I then run transaktion SWPR (Restart After Error) the workflow continue
and finds the right user. Binding seems to be OK. Release is 4.6C
 
Any ideas ? - thanks in advance.
 
 
Regards,
 
Claus.