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A reference to This element references a StudyEventGroupDef as it occurs within a specific version of a Studystudy. The list of StudyEventGroupRefs identifies the types of study group events that are allowed to occur within the study. The StudyEventGroupRefs within a Protocol must not have duplicate StudyEventGroupOIDs nor duplicate OrderNumbers.
The OrderNumbers provide an ordering on the StudyEventGroupDefs for use whenever a list of StudyEventGroupDefs is presented to a user. They do not imply anything about event scheduling, time ordering, or data correctness. Order of execution and timing between studyevents study events and groups of them study events must be defined in WorkflowDef elements. Scheduling will be realized in StudyTiming and its child elements that reference StudyEventGroups.
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