AMDP methods for DDL Objects cannot be tested and were removed

What causes this issue?

Methods for DDL Objects have no executable units and can only
be used by other AMDP methods.

System Response

Methods were removed from the node containing testable
methods.

How to fix this error?

The AMDP methods for DDL Objects can only be indirectly tested
by other AMDP methods.

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.