Diagnosis
You have created a service entry sheet and have already enteredperformed services. You then attempted to copy planned services fromthe purchase order into this entry sheet.
This function is only possible if you invoke it immediately whencreating a new entry sheet.

Procedure
Decide whether you wish to
create a new service entry sheet in which you immediately adopt theplanned services from the PO and then add any relevant unplannedservices, or
delete the already entered services and then first adopt the plannedservices from the PO.