Chain Carryforward PO

Good morning,

I have a Fund reservation of 1.000 and related to it a Purchase order of 100.

Through FMJ2 I select the carryforward of the PO (value type 51) and its budget associated.

Expected result: I would like the carryforward to take just the 100 related to the PO, 100 from the Fund reservation and of course the 100 for budget.

     Budget:                +100

     Commitments:      FR +100 & -100 and PO +100

Result: the problem is that also takes the rest of the fund reservation (900) as commitment and also as budget.

     Budget:                +100 + 900

     Commitments:      FR +100 -100 +900 and PO +100

Any idea about how to control this?

regards,

Daniel