Check variant: Attributes are not complete (&1)

What causes this issue?

In the check variant, there is at least one check (&V1&) in the check
variant that cannot be executed because its attributes are not fully
maintained.
@1E@ Attributes are fully maintained
@1F@ Attributes are not fully maintained

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?

In the check variant tree, search for activated check variants whose
attributes are not fully maintained, choose the |@1F@| icon, and
complete the attributes.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.