A reference to an ItemDef as it occurs within a specific ItemGroupDefValueListDef. The list of ItemRefs identifies the types of items that are allowed to occur within this type of item groupvalue list.
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The ItemRefs within a single ItemGroupDef ValueListDef must not have duplicate ItemOIDs nor OrderNumbers.
The OrderNumbers provide an ordering on the Items (within a containing Item GroupValueList) for use whenever a list of Items is presented to a user. They do not imply anything about event scheduling, time ordering, or data correctness.
The Mandatory flag indicates that the clinical data for an instance of the containing item group value list would be incomplete without an instance of this type of item. ODM clinical data files that are incomplete in this sense may be considered incomplete for study review and analysis purposes.
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