The wildcard principle has been violated.

What causes this issue?

When maintaining characteristic values for an alternative control, you
cannot use wildcards before fixed values in alternative controls.

How to fix this error?

In the alternative control, ensure that the characteristic value
containing a fixed value is before any characteristic value containing a
wildcard.

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.