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A Transition defines a link between two structural elements in a workflow where there is no branch.
The SourceOID references the definition of the source structural element for the transition. This can be a StudyEventGroupDef, StudyEventDef, ItemGroupDef, ItemDef, or ItemDef Branching element.
The TargetOID references the definition of the target structural element of the transition. This can be a StudyEventGroupDef, StudyEventDef, ItemGroupDef, ItemDef, or Branching element.
The latter will be used when there is a branching definition necessary as a result of the transition.
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