A Stores Requisition (SR) is a document created ahead of creating a MIR. There are five methods to create an SR:
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Manually
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By Reservation Run
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By Manual Reservation
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By MRR (Material Receiving Report)
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By Deferred Heat Number
Whatever method is being selected, the items being put on an SR will remain as On-Hand quantity in the Warehouse. However, only quantities that On-Hand can be put on an SR. As a consequence, SRs can be created for the same physical inventory quantities multiple times. As the SRs will be the basis for an MIR, when creating an MIR based on an SR, the corresponding quantities are no longer available in the inventory thus the MIR cannot be created with the same set of quantities like the SR.