Answer / alok kumar tripathy

It is a request of material requirement to purchase dept.
from user dept.It is created when business runs MRP or it
runs based on consumption based planning(CBP).

It is used in MM module to procure material for
production / engg. stores.

T-code for PR processing is Me51n in SAP.

Answer / pralhad kumbar

A requisition defines the need for a material or service.
It is the primary document in the purchasing cycle. It
replaces the document called “Indent” (in case of purchase)
and “Works Indent” (in case of service) as per legacy
terms.Purchase Requisition for direct capitalization is for
those materials whose cost will be directly capitalized to
an Internal order. The document will be used to provide
requirements of capital nature items from all departments
to the purchasing department. The purpose of requisitioning
should be capital in nature and the material requisitioned
may/may not be part of inventory at the plant. The
requisition authorizes the Purchasing department to
purchase materials in specific quantities within a
specified time frame. It is an internal document and is not
used outside of the company. To create PR T-CODE ME51N

Answer / krahul

Purchase Requisition or Purchase Request is document
generated by a internal organization to notify the
purchasing department of items it needs to order, their
quantity, and the timeframe.

Creating a Purchase Requisition:

Menu Path: Logistics -> Materials Management -> Purchasing -
> Purchase Requisition -> Create

Transaction Code: ME51

You can also refer:

http://help.sap.com/saphelp_ides/helpdata/en/fd/45c29d9d6411
d189b60000e829fbbd/content.htm

Answer / anant verma

Purchase requisition is the pre-process of purchase order. It means, the user or the store department requests the purchase department for the approval for purchasing some material.

It is used in MM because if PR is approved and PO is made then it directly affects the quantity of material for inventory in MM.

T-Code ME51N

Answer / chandra shekhar agarwal

T CODE : ME51 or ME51N

It is a request or instruction from particular department
(Cost Centre) to purchasing department to procure certain
quantity of material and services. It is only one internal
document in SAP-MM.

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