This X12 Transaction Set contains the format and establishes the data contents of the Requisition Transaction Set (511) for use within the context of an Electronic Data Interchange (EDI) environment.  This transaction set can be used to requisition needed material and equipment from a supply distribution system for immediate consumption or stockage against projected requirements.  The originator can also use this transaction set to amend or terminate the original requisition.  This transaction set may be used to convey a description and quantity of the required material, delivery and billing information, and other logistics information necessary to evaluate and meet the material needs of the originator.  This transaction set is not used to establish a contractual relationship between trading partners, and may precede the use of a purchase order.