Enter category, type, and identifier

What causes this issue?

You maintained an identifier but you did not make a required entry in
one of the fields below:
Identification category
Identification type
Identifier

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?

Ensure that you make all required entries.

Error message extract from SAP system. Copyright SAP SE.