AckVersion - X12 only

If acknowledgements are generated, the AckVersion element specifies which version is to be used. The version must be a valid X12 version such as "004010". If no value is specified, the default is to use the same version as the group that is being acknowledged.

For EDIFACT data, this element is not used, and the CONTRL acknowledgement is generated by using the same syntax version as the interchange that is acknowledged.