Preliminary Purchase Requisition is for Advance procurement.
When requirements are activated (Activity Released ), the system generates preliminary purchase requisitions and planned independent requirements for components that are procured in advance.
Materials planning treats a planned independent requirement as a requirement. Afterwards when a real requirement is generated and the system finds a component for which a sufficiently large planned independent requirement exists in the same individual stock segment, then these requirements will be set off against each other. This means for project stock that the components have to be assigned to the same WBS element.
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