UWL workitem error: you are not a receiver of the work item
I have created a workflow with 2 decision steps. When testing the workflow through the SAP inbox (SAP Business Workplace), when the first agent approve the workitem, it is forwarded to the second agent who can also approve or refuse the workitem, which then ends the workflow.
When testing the same process in the portal UWL, the first agent receive the workitem and approve it. The second agent receive then the workitem, but when I open it to approve it, I have this error message: "you are not receiver of the workitem" !!
How come I am the right receiver of the workitem in R/3 and not in the portal ? We are using a CUA so users in the portal and R/3 are the same, the webflow connector is working, SSO has been set up.
Thanks in advance for your help.