Trade level is still used. Cannot delete.

What causes this issue?

The selected <DS:DE.J_7LHDLST>trade level</> is still used in REA master
data.

System Response

The trade level cannot be deleted.

How to fix this error?

First delete the trade level from the REA master data. To do this,
choose REA Information Systems -> Assignment -> Article to ->
<DS:TRAN.J7LIZAR>Recycling Partner</> or Article to ->
<DS:TRAN.J7LIZAV2>Packaging (Recycling Partner-Dependent)</> or
Packaging to -> <DS:TRAN.J7LIZVR>Recycling Partner</>.
The trade level may still be assigned to a
<DS:DE.J_7LHDLSTKO>trade level combination</> in
<DS:TRAN.J7LRRE711000162>REA Customizing</>.
The trade level can also be assigned in the detail screen of the
company code for the recycling partner (pushbutton @3R@).
You can also suppress the use of the trade level in the article master
data and the packaging master data by deactivating it
(<DS:DE.J_7LHSTX1>Indicator Trade Level Attribute 1</>).

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.