Diagnosis
You have entered an item category to whichschedule line categories have beenassigned in Customizing. This item category will be used to initiatethird-party order processing.However, third-party business transactions are not permitted forscheduling agreements with delivery orders, or for delivery ordersalone.

System Response
The system rejects the entry.

Procedure
Enter another item category, or change the schedule category assignmentfor the item category in Customizing.