Hello Dex,
Were you able to resolve this issue or SAP provided anything?
I faced a similar issue where VENMAP has 1 entry related to the vendor but that is wrongly linked to the plant business partner. Also, re-running BBPGETVD doesn't help because it throws an 'already existing' information message and stops. What I feel is, if VENMAP gets updated with the new vendor (which is an intercompany vendor) and also gets linked to the correct business partner (same name as the IC vendor), then it should be visible in PPOSV_BBP.
Please let me know if you've faced similar issue?
Regards,
Abhishek