You have the following options:
Vendor known
Use this procedure if you know which vendor is to receive the order.
Vendor unknown
Use this procedure if you want the system to select and suggest possible vendors. These suggestions are then made on the basis of sources of supply that have been predefined in the system. (Note: the term "source" covers outline purchase agreements, info records, and source lists).
Creation of POs from assigned requisitions
Use this procedure to list the requisitions for your purchasing group that have already been assigned to a vendor (that is, those requisitions containing a vendor, outline agreement, or info record as a procurement option). P os can be generated from these requisitions automatically.
Stock transfer
Choose this procedure if you wish to order not from a vendor but from one of your plants.
Vendor-managed inventory (VMI)
You use this procedure if you wish to create a purchase order from a confirmation sent to you by your vendor via EDI.
See
SAP Retail
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Vendor-Managed-Inventory (VMI)
SAP Retail
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VMI: Generating POs for EDI Order Acknowledgements