3286623 - NAST: multiple outputs created for same partner role if more than one partner is assigned to vendor with same partner role

You have a vendor master record which you use in a certain purchasing document, like purchase order, contract or scheduling agreement (such documents which got NAST output processing setup). In that vendor master you got from a partner role (for example OA - ordering address) more than one partner (so you got for example two OA partners in your vendor master).
You flag one of these partners to be the default partner (of the two same partners).
You maintained in the suitable MN* transaction (MN04 for purchase order for example) NAST based condition record (so in this case for OA partner role) without specifying the partner nr. itself!
But even with this you notice that the system creates as many outputs as many partners listed in vendor master (and hence in the document) with such partner role from which more than one partner entered (so if you got two OA partners, then two NAST outputs created, 1-1 to each such partner), even if one of them was chosen as default.

XNAST_FUELLEN NAST output nachricht partner msg_part doubled twice duplicated , KBA , MM-PUR-GF-OC , Message determination and printing , Problem