Customer belongs to customer group & and thus cannot be the sold-to party

What causes this issue?

The customer specified has an <GL:account_group>account group</> which
cannot be used for sold-to parties.

System Response

The customer cannot be entered as a sold-to party as the system cannot
determine whether all master data has been properly maintained.

How to fix this error?

Using the partner function assignment for account groups, you can
configure which account groups are permitted for sold-to parties.
INCLUDE 'NA_CUST_MAINTAIN_3' OBJECT DOKU ID TX LANGUAGE E
IF &DEVICE&='SCREEN'
<ds:TRAN.VOPA>Proceed</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.