FMBB documents created through BAPI are not passing through FMCUDERIVSUB derivation

Dear experts,

we are having a "z" transaction from which we create FMBB documents by using BAPI_0050_CREATE.

However, those FMBB estandar documents that are created are not having the correct final Funds Center and Commitment Ítem because the BAPI is not going to FMCUDERIVSUB. FMCUDERIVSUB is aimed to derive and substitute the Funds Center and Commitment Ítem values (if they are derived to different values in that fmcuderivsub derivation) in FMBB documents.

Could you please help in what should we do to get that derivation through BAPI? Maybe we should use another BAPI, maybe we should send a specific values to that BAPI through specific fields...

Thank you very much.

Best regads,

Mercedes.