unconfirmed quantity for the item level - "reason for rejection"

Dears,

We are working with Prod. Allocation check at APO. We'd created a exit to unconfirmed quantity when it is put the "reason for rejection" for the item level. It is working fine at ECC side but it wasn´t deallocated in the APO.

Are there some program that must called to transfer the unconfirmed qty from ECC to APO?

Many Thanks.