Transfer of down payment request to FI without dunning area

Hello,

when creating a down payment request through VF01 I succeed in filling the dunning area.

However, the FI-document line does not contain the dunning area.

Dunning by dunning area/Company code is set.

Customer "equipped" with dunning area.

Field BSEG-MABER open for posting (e.g. within F-37 within FI).

Perhaps you have a hint for a successful transfer.

Thanks a lot in advance.

Thomas