The Quick reference on Purchase Requisition for Material mangement module will provide you all the steps in:

• Create Purchase Requisition for Non-Stock Materials- ME51N
• Create a Purchase Requisition for Services – ME51N
• Change a Purchase Requisition – ME52N
• Display a Purchase Requisition – ME53N
• List Purchase Requisitions- General Display – ME5A
• List Purchase Requisitions- General Display – ME5K
• List Purchase Requisitions- By Service – MSRV2
• Display a Purchase Requisition – ME53N
• Reject a Purchase Requisition – ME54N
• Change a Purchase Requisition – ME52N
• Release a Purchase Requisition – ME54N