SAP Message 3G179 - EXIT_RPCIPE00_001: Acc.assgn.type changed to invalid assgn in user exit

Diagnosis
When working through the BAdI implementation (definition nameSMOD_PCPO0001, method EXIT_RPCIPE00_001), the symbolic account waschanged from &V1& to &V2&.
The old symbolic account &V1& has the account assignmet type &V3&, thenew symbolic account &V2& has the account assignment type &V4&. Such schange in account assignment type is not permitted.

System Response
The employee is rejected.

Procedure
When implementing method EXIT_RPCIPE00_001, the symbolic account canonly be altered in such a way that the account assignment type retainsthe same information as was stored in the posting item.
This means that it is not possible to change the symbolic account froman expense account to a payables account and vice versa.