Matchcode ID &-& could not be activated

What causes this issue?

The matchcode ID could not be activated due to inconsistencies.

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?

You can find out why activation was terminated by looking at the
activation log. Select <LS>Display log -> Activate</> in the utility
menu of the matchcode ID maintenance screen.

Error message extract from SAP system. Copyright SAP SE.