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A 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) itemgoupitemgroup. The ItemGroupRefs within a single StudyEventDef or ItemGroupDef must not have duplicate ItemGroupOID or OrderNumber attribute values.
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