Incorrect characteristics combination(s)

What causes this issue?

There are either double characteristic values combinations or
characteristic values combinations that are not definitive.

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?

Delete the double entries from the work list and/or check whether the
characteristic values are defined.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.