Format/length:	n3
HES item:
National Codes:
Default Codes:

Notes:

Definition:
A code to identify the CDS Exchange Protocol and Update Mechanism associated with the transaction.

Permitted values are:

CODE	CLASSIFICATION
010	Net Change Update Mechanism
020	Bulk Replacement Update Mechanism

Usage:
This is a mandatory data item for the processing of CDS data.
The rules for the derivation of the CDS Protocol Identifier are detailed in the NHS CDS Manual.