SAP Message BP377 - Only an FM account assignment is allowed as a sender

Diagnosis
You have entered conflicting FM account assignments (funds center,commitment item) for the distribution of the budget of tableDOC_ITEMS_SENDER.
Processing is only possible if the same FM account assignment isentered in all lines of the table.

System Response
Processing cancelled.

Procedure
Enter the same FM account assignment in all lines of the table.