Activating all Requirements in a Hierarchy 
A dialog box appears.
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A networkThe system creates purchase requisitions and MRP relevant reservations for all material components and externally processed activities in networks.
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A WBS elementThe system creates purchase requisitions and MRP relevant reservations for all activities (and the assigned material components) in networks that are assigned to the WBS element.
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An activityThe system creates purchase requisitions and MRP relevant reservations for the activity and the assigned material components.
A message appears telling you how many entries were changed.