Packaging category is still used. Cannot delete.

What causes this issue?

The selected <DS:DE.J_7LVRPKT>packaging category</> is still used in the
REA master data.

System Response

The packaging category cannot be deleted.

How to fix this error?

First delete the packaging category in the REA master data. To do this,
choose REA Information System -> Assignment -> Packaging to ->
<DS:TRAN.J7LIZVF>Material Type</>.

Procedure for System Administrators

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.