SAP Note 25150 - ME21 CO objects disappear after entry

Symptom:

The account assignment objects entered on the account assignment screen disappear when creating an assigned order item (transactions ME21, ME22).

Cause and prerequisites

Several CO function modules are processed on the account assignment screen, including function module FMCO_WRITE_CASH_FLOW_MM_EKOPI. This function module does not contain any program code. However, the structure COBL is transferred to the import structure I_COBL with the account assignment objects and the export structure E_COBL is allocated to COBL again without the the statement E_COBL = I_COBL being executed. As a result, all the data in COBL is lost.

Solution
Maintain table TRWPR with transaction SM31. Delete the entry that starts with the two key fields BEST and CHECKALL and has function module FMCO_WRITE_CASH_FLOW_MM_EKOPI as the last field. After deleting this entry, the error should no longer occur.