Possible entries for partner number & exist already

What causes this issue?

The proposals found for partner type &v2& already exist in the partner
profiles for partner &v1&.

System Response

No further entries can be generated for partner &v1&.

How to fix this error?

Using the standard transaction, you can change the existing entries or
add new entries.
Alternatively, you can create more proposals for partner type &v2& in
Customizing.

Error message extract from SAP system. Copyright SAP SE.