No & action for classification matchcode ID &-&

What causes this issue?

The database functions CRE and DEL are not permitted for matchcode IDs
with update type 'K' - the so-called classification matchcodes.
They are meaningless.

System Response

Continues.

How to fix this error?

Select the correct matchcode IDs to be maintained.

Error message extract from SAP system. Copyright SAP SE.