No unassigned data filter for regional processing exists

What causes this issue?

You should input entries for <DS:DE.J_7LKZFREG>regionalen
processing</>, but regional processing is not possible.

System Response

You cannot make entries.

How to fix this error?

1. Check whether regional processing is permitted for this article in
<DS:TRAN.J7LS>REA Customizing</>.
2. Ensure that the entries are consistent and, in particular, that
<DS:DE.KUNNR>customers</> and <DS:DE.LIFNR>suppliers</> exist in the
respective company code.

Error message extract from SAP system. Copyright SAP SE.