SAP Message >0013 - Formal error: Invalid call of function module FKK_COLL_BILL_CHANGE_AMOUNT

Diagnosis Program error changing collective bills.The collective bill amounts are changed such that they no longer allhave the same +/- signs. System Response Error message and termination of processing. Procedure INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX Procedure for System Administration INCLUDE FICA_NA_OSS OBJECT DOKU ID TX