The following information is applicable to data set specifications only.
An indicator of whether the data element or data set specification is mandatory, optional or conditional for the data collection or transmission.
Mandatory completion signifies that the data element/data set specification must be included.
Conditional completion signifies that under specific criteria, a data element/data set specification must be included. The criterion by which a value can be included can be specified within the Verification rules attribute.
Optional completion signifies that a data element/data set specification may or may not be collected.