Sales group &1 is not defined for sales office &2

What causes this issue?

<GL:sales_group>Sales group</> &V1& is not allowed in <GL:sales
office>sales office</> &V2&.
INCLUDE 'NA_NO_PROCESSING_2' OBJECT DOKU ID TX
INCLUDE 'NA_CHECK_ENTRY' OBJECT DOKU ID TX LANGUAGE E
You can display the entries allowed in combined with this sales office
by placing the cursor on the <LS>sales group</> field and selecting F4
(Possible entries).
You can create additional sales groups or change allocations made for
sales offices in <GL:customizing>Customizing</> for Sales if you have
the authorization to do so.

Error message extract from SAP system. Copyright SAP SE.