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Include PageItemGroupRef ElementItemGroupRef Element Include PageItemGroupRef AttributesItemGroupRef AttributesA reference to ItemGroupRef references an ItemGroupDef as it occurs within a specific StudyEventDef or ItemGroupDef. The list of ItemGroupRefs identifies the types of item groups that are allowed to occur within this type of studyevent or (nested) itemgoupitem group. The ItemGroupRefs within a single StudyEventDef or ItemGroupDef must not have duplicate ItemGroupOID or OrderNumber attribute values.

The OrderNumber attribute provides an ordering on the ItemGroupDefs (within StudyEventDef or ItemGroupDef) for use whenever a list of ItemGroupDefs is presented to a user. Order of execution is preferably defined in a workflow (element WorkflowDef)  but when used without a workflow, may be used the define the order in which data entry forms are presented in an application UI. 

The Mandatory flag indicates that the clinical data for an instance of the containing event or itemgroup would be incomplete without an instance of this type of itemgroup. ODM clinical data files that are incomplete in this sense may be considered incomplete for study review and analysis purposes.