For each Interchange submitted, the CDS INTERCHANGE CONTROL REFERENCE must be incremented by 1. The maximum value supported is n7 and wrap around from 9999999 to 1 must be supported.

Usage:
CDS INTERCHANGE CONTROL REFERENCE is a mandatory data element when submitting Commissioning Data Set Interchanges and is used to uniquely identify and if required, to sequence check Commissioning Data Set submissions.

For Commissioning Data Sets 6-2 and 6-2-3, the XML schemas allow a maximum of an14 alphanumeric characters.  This Format/Length was defined historically, but the Secondary Uses Service has always allowed a maximum of 7 numeric characters with a maximum value of 99999999.  In Data Dictionary Change Notice 1808 "Correction of Format/Length Data Elements" this anomaly has been corrected.  From Commissioning Data Set version 6-3 onwards, the XML schema has been amended to carry the correct format/length of max n7.

This control reference data may also be presented on Secondary Uses Service (SUS) service messages and audit logs, etc.

CDS XML Schema Interchanges:
All CDS XML Schema interchanges submitted must contain a CDS INTERCHANGE CONTROL REFERENCE.

Note: the Format/Length has been updated in Data Dictionary Change Notice 1808 "Correction of Format/Length Data Elements". The Data Set specifications that contain this item will be updated in the next version of the Information Standard where it is not already correct.

This data element is also known by these names:

Context	Alias
plural	CDS INTERCHANGE CONTROL REFERENCES