SAP Note 23208 - FI interface: New company IDs

Symptom:

The company IDs in the group have changed. The user defined new company master records and entered them in the vendor and customer master records of the members of the consolidation group.
Open items from the time before the conversion still have the old company IDs. During clearing, these numbers are copied to the clearing documents in order to have a zero balance for payables and receivables for each partner company in FI. If necessary, the clearing documents are directly posted to other ledgers, which means the old partner company ID is updated there, too.
The customer has changed from manual entry to direct posting, but already used the new company IDs for the manual entry.
How can you make the consolidation module use the new company IDs for clearing?

Solution
Using substitution to change the partner company in the FI document is not supported. However, the Partner company field can be changed with a user exit when updating in a ledger (here: the consolidation ledger).

Vorgehensweise:
o In the ABAP program RGIVUmmm (with mmm = current client), you have
to onsert a new routine.
- If the program already exists, then choose a two-digit exit
number xy, for which NO routine Exy_MVC exists yet in the
ABAP program.
- If the program does not exist yet, then create it as a local
private object with category '1' and the application 'F' under
the development class $TMP. In this case, you can use xy=01 as
exit number.
- Insert the routine Exy_MVC in the ABAP program
(see example below)

o Enter the user exit in the used field movement
- Configuration menu -> Spec. Purpose Ledger -> Environment ->
Master data -> Field movement
- Choosing the used field movement (SAP standard
is 0002 for updating in GLT3 and 0003 for GLT2)
- Inserting Uxy in the User exit field of the line
RASSC BSEG VBUND