User can place a requisition for purchase.

In the requisition from user will get following fields:

• Product (Inventory Product reference): Select field when user can select product from inventory. Odoo entity reference
• Quantity: A text field where user can place integer number
• Unit of measure (UOM reference): Select field where user can select inventory’s unit of measure.
• Delivery date: Odoo date field
• Location (Inventory stock location reference): Select field where user can select Warehouse location.
• Name: An automated sequence number

Initially requisition is saved as draft state, when user approve that requisition by clicking a button named "Approve" a purchase order will be created in draft mode. This draft Purchase order is actually purchase order in quotation state. And later PO will be conformed by user manually.