EMDIS message: MSG_DEN

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

While the 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.

The ORG_DEN contains for instance the function that caused the message to be denied. This field is used for debugging purposes. A message that was denied was not processed at the recipient’s side and has to be resent. The message has to be presented to the responsible user (search coordinator) by the local EMDIS administrator in an appropriate manner. The optional REF_CODE should be present if it is a required field in the message referenced by MSG_CODE. A WARNING should be issued if not. For a message with multiple errors, only one MSG_DEN message has to be sent back.