The message denial is intended as an immediate response in the event that a particular message will be not acted upon. The reasons for such a response are variable. Some examples include:
- The message submitted is not supported by the responding hub
- The message submitted or the associated action violates a house rule of the responding hub
- The message submitted or the associated action violates the EMDIS semantics
MSG_DEN is a critical part of the EMDIS semantics, care should be taken to avoid scenarios in which a
MSG_DEN is routine or expected. The
MSG_DEN should largely be reserved for exception scenarios. A proliferation of
MSG_DEN messages may indicate a system defect either on the part of the submitting or responding hub.