A workflow task defines a set of changes to be performed for a hierarchy node in a Data Relationship Management version. Each stage of a workflow model identifies the tasks applicable to that stage for requests using the model. Workflow tasks are performed during requests by adding or editing request items. A request may consist of one or more request items which may be added during initial submission or later enrichment of the request. During Submit or Enrich workflow stages, new request items can be added to a request to perform additional tasks. During Enrich stages, request items added in previous stages can be edited using an update task assigned to the workflow stage. Request items can only be deleted during workflow stages which have a matching workflow task to the request item. The order of request items in a request is important because it controls the order in the changes in the request get applied to the target version for validation and commitment purposes.