CDS Interchanges submitted or received must use the correct CDS Header and Trailer Controls to provide Interchange and Message addressing and identification.
Every CDS Interchange must consist of:
Multiple CDS messages are usually sent in a single CDS Interchange.
The CDS Message Trailer signifies the end of a CDS Message and contains control information for the Message.
|M||NO OF SEGMENTS IN MESSAGE (NHSCDS EDIFACT Message only)|
|M||CDS MESSAGE REFERENCE|