Payment terms in the PO is not picked correctly

Hello SAP SRM Gurus.

We have a problem when we are creating a PO. Problem is, we have a vendor extended to more than one Purchase organizations. Example - Porg - 7710, 7720, 7730, 7740 so on...

When the PO is created for Purchase organization 7730, it picks the Payment terms of first porg in the vendor i.e 7710.

If the vendor is extended to only 7730 and 7740, it picks the first Payment term i.e 7730. How to solve this issue. i think this is a standard issue.

Please help me on this.

Thank you,

Ajay