Message Specification

Segment	Field	Component	Length Constraint	Notes	UKRDC DB Location
MSH
	MSH-3			Sending Application
		MSH-3.1		Sending Application Name	???
	MSH-4			Sending Facility
		MSH-4.1		Sending Facility Name	???
	MSH-5			Receiving Application	N/A
	MSH-6			Receiving Facility	N/A
	MSH-7			Message Timestamp
		MSH-7.1		Message Timestamp
	MSH-9			Message Type
		MSH-9.1		Message Type	QRY/ADT etc.
		MSH-9.2		Trigger Event	A19/A28/A31 etc.
	MSH-10		256	Message Control ID
		MSH-10.1		Message Control ID	We need to generate a persistent unique value from a table or sequence for this.
	MSH-11			Processing ID
		MSH-11.1		Processing ID	P
	MSH-12			Version ID	N/A

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