Shipping point & is still assigned to a picking location

What causes this issue?

There is still a picking location assigned via the storage condition to
the shipping point and plant (picking location determination).

System Response

The R/3 System cannot delete the plant and shipping point assignment.

How to fix this error?

If you want to delete the plant or shipping point assignment, you must
first cancel this picking location assignment in
<DS:SIMG.SIMG_CFMENUOLSDOVL3>Customizing</>.

Error message extract from SAP system. Copyright SAP SE.