SAP Message WS601 - Message type &1 does not support transmission medium &2

Diagnosis
During processing of messages, a message assignedto message type &V1& was to be output viatransmission medium &V2&. However, thistransmission medium is not supported by the message type.

System Response
The system cannot process the message.

Procedure
To avoid further messages being created with this medium, you shouldmake the relevant settings in Customizing for Agency Business. Thisaffects the message type and the message condition records.
The Customizing documentation indicates which transmission media aresupported by a message type.
Messages that have been created with a transmission medium that is notsupported cannot be processed.
Please contact your system administrator.