Structure of selection &1 is not allowed

What causes this issue?

You can only use the name of a combination if a main selection in this
combination has been defined as a new combination and not as an
additional selection.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.