Incorrect class category of class &

What causes this issue?

The class used to generically specify the filter values for creating
control composites has the wrong category. So that the class can be
used, it must have the "General Class" category.

System Response

This class cannot be accepted.

How to fix this error?

Enter an existing class of the "General Class" category or a class that
does not exist.

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.