Vendor number is not the same as the business partner number

What causes this issue?

If you have set the <LS>Same Numbers</> indicator then the business
partner number and the vendor number have to be the same.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Transfer a vendor number that corresponds to the business partner
number.
Check whether the correct settings have been made in Customizing in the
activity <DS:SIMG.V_TBC001>Define Number Assignment for Direction BP to
Vendor</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.