A 'Requisition' is a formal request by a department in an organization to purchase a material. Thus, in a manufacturing company, the procurement requirements would be identified. Requistions would then be created and approved. The requisition is thus the starting point for all purchasing activity in an organization. SAP Materials Management also has the concept of purchase requistions. At the time of creating a purchase requisition in SAP, the following data is entered.

1. Document Type
2. Requisition Number
3. Material Number
4. Account Assignment Category
5. Requested quantity
6. Delivery Date
7. Number of the receiving plant
8. Storage location
8. Purchasing group code

Requisition number are automatically assigned in SAP if internal number ranges are specified. In case of external number ranges, requisition numbers have to be punched in manually. I personally advise clients to
have internal number ranges. This is a recommended SAP best practice.

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