We are merging a controlling area 1000 into a controlling area 2000 as of April 1. During the April payroll retrocalculated posting into controlling area 1000 occurs. Because posting into the previous controlling area in April is not possible, due to the closed controlling area, we are looking for a solution. One is to open the old controlling area for the posting into April, where the controlling area doesn't exist anymore and manually post the FI posting from 1000 into 2000. This is not our goal. We heard that a modification of RPCIPE00 is possible, but we need to know, where exactly this could be done. We have a mapping of old cost center to new cost center. Or is there an easier way to handle the problem?