FM error clearing error (FMUP137)

Good afternoon,

We have in this company a Budget structure with fund, fund centre, functional area and commitment item.

We carry out a downpayment agaistn a PO. Then, through transaction code MIRO, we post following document:

1.- 31K Vendor

2.- 86S Goods receipt

3.- 39K A Vendor (Suppliers Down payment)

4.- 27K Vendor

Position "1" does not impact budget (GL with a commitment item with Financial transaction 60). Positions "2" and "3" are netted in budget terms.

The problem arise with position "4" as the system derives the commitment item from the functional area (FMDERIVE. Derivation rules used for other cases) instead of taking the one defined in the GL account (GL with a commitment item with financial Financial transaction 60). Any idea?

Because of that, during the clearing of the advance payment and the invoice we get an error related to the online payment (Unpermitted business transaction - Message no. FMUP137).

Please let me know.

Thanks

Daniel