Certificate ID &1 and number &2 cannot be used for this vendor

What causes this issue?

The specified certificate ID and number are configured for another
supplier. The same certificate ID and number cannot be used for more
than one supplier.

System Response

The system does not allow you to edit the certificate details.

How to fix this error?

Check the certificate ID and number configured for this supplier using
the transaction BP and use the correct certificate ID and number.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.