Entries generated by valuation cannot be deleted manually

What causes this issue?

Defect records, which are generated automatically by valuating the
inspection characteristic, <ZH>cannot</> be deleted manually.
The entries are deleted automatically when the characteristic valuation
changes.

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 only delete the defect records manually in the quality
notification.
Note
The quality notification is then activated and must be closed manually.

Error message extract from SAP system. Copyright SAP SE.