No form assigned to doc. &1 in document type control

What causes this issue?

The document type &V1& was not assigned a form in the declaration
output control.

System Response

The printed document may be incorrect.

How to fix this error?

Please maintain a form for re.partner &V2& in the
<DS:TRAN.J7LE>re.partner</> dialog (->document types->detail) according
to REA requirements.

Error message extract from SAP system. Copyright SAP SE.