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User-Defined Standard Tasks and Workflow Tasks in Milestones 
You can use the milestone function start workflow task in a network to start:
depending on the status of the activity to which the milestone is assigned. You can use network and activity data for the task. For this, however, the tasks must fulfill certain requirements.
For more information on how to define user-defined standard and workflow tasks, refer to the Implementation Guide for the Project System under Workflow.
