Role Error in Workflow

[Louise Morgan]

We're working on 4.6B of Connect and Go and have an issue with a Workflow to
support Expense Approvals on the Production client.
 
The Workflow starts correctly but when it gets the approval step which has a
Role (based on a function module) it errors.  The error log shows that no
agent is found and Role AC9xxxxx cannot be resolved.  However, when the
Workflow is manually restarted from transaction SWPR, the role resolves
correctly and the user decision task is routed to the right agent without
any problems.
 
Prior to the approval step, there is a condition step that evaluates whether
the expenses must first be checked by an administrator.  If it doesn't have
to be checked by the administrator the Workflow moves straight on to the
approval step otherwise a user decision task is routed to the administrator.
It is only when the Workflow takes the branch via the administrator that it
errors on the approval role following completion of the check.  Going
directly from the condition step to the approval step does not result in an
error.
 
The approval Role always resolves correctly when it is tested via PFAC so I
do not believe there is an Organisational issue.
The Workflow is correctly passing in the container elements the Role
requires.
We have tried creating a new Workflow definition and re-transporting which
has not resolved the problem.
The Workflow was fully tested in DEV & QA clients without issue.
 
Can anyone shed any light on what the problem might be?