Diagnosis
For new records with a partner function that refers to partner functionMP, you should enter a valid SAPoffice user. Usually, the SAPofficeuser is identical to the SAP user.

System Response
The system does not accept the recipient!

Procedure
Enter the SAPoffice user or the SAP user or leave the partner fieldempty. Choose Enter!
You can assign the partner at a later time by choosing possible entriesfor the partner number field or by branching to "Communication".