sap Note 12971 - All reservation items have same account assignment

Symptom:

All items of a reservation have the same account assignment.
Therefore, it is not possible to assign the individual reservation
items to different cost centers, projects, etc.

Cause and prerequisites

The account assignment is contained in the header of the reservation
and applies to all items in the reservation.

Solution
Please create a separate reservation for each account assignment.

Key word: Acc. assgt: res