Vendor number is missing in SRM PO

We have SRM 7.13 with classic scenario.

We have scenario in which PR is created from ECC pushed to SOCO and from there PO will be getting created for Items

I have issue in one PR PO is got created but that is not having any vendors

I can see in SC is created for materials and there is checkbox tiked " DIRECT MATERIAL" for line items.

POis got created in HELD status in ECC. In BBP_PD SRM neither supplier seen for PR , SC nor for PO.

What to do in this case ??

Kaustubh