Default branch code for vendor missing

What causes this issue?

Default branch code for vendor missing

System Response

System does not let you proceed further.

How to fix this error?

You have made changes to the vendor master data by deleting a default
branch and want to exit the Branch Code screen. This is, however, not
possible because you need to assign a default branch prior to exit.

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.