OrderNumbers provide an ordering on the StudyEventDefs for use whenever a list of StudyEventDefs is presented to a user. They do not imply anything about event scheduling, time ordering, or data correctness. Order of execution and timing between study events and groups of study events must be defined in WorkflowDef elements. Scheduling will be realized in StudyTiming and its child elements that reference StudyEventGroups. | - The StudyEventRefs within a StudyEventGroup must not have duplicate OrderNumber values.
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CollectionExceptionConditionOID | oidref | Optional | Reference to a ConditionDef If the CollectionExceptionConditionOID attribute is provided, it references a ConditionDef that describes the circumstances under which data for this study event should not be collected. | - The CollectionExceptionConditionOID value must match the OID attribute for a ConditionDef in this Study/MetaDataVersion.
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