Maintain outgoing EDI-connection data for partner &

What causes this issue?

The system could not locate the EDI partner agreements (outbound) for
partner &v1&.

System Response

You cannot use transmission medium 'EDI' with this partner.

How to fix this error?

Maintain the EDI partner agreements for partner &v1&. Make sure to
create entries for output control as well as for outbound parameters.

Error message extract from SAP system. Copyright SAP SE.