Hi Claudio,
FMCG works with reassignment strategy which you define and assign in IMG activity Public Sector Management - Funds Management Government - Master Data - Derivation Strategy for Reassignment. You will find a lot of material if you browse SCN for FMCG. In FMCB you are not obliged to create a strategy: you can assign the new fund centre directly in the transaction.
Regards,
Eli