BIG 4 usually refers to the largest accounting firms: Deloitte & Touche, Ernst and Young, KPMG, and PricewaterhouseCoopers.
BAY, in business / accounting, means Buy Another Yearly.
MATERIAL REQUISITION PLANNING (MRP) entire purpose is to plan for materials that are required for a particular purpose. An MRP is usually automated using transaction codes. MRP can be done for a single material item or a multilevel plan can be run for a material within a plant. MRP creates purchase requisitions, purchase orders, or planned orders for the material. This is done on the basis of the settings selected in the transactions. To take an example, a particular material item may be procured externally, in such a case; an MRP run creates requirements for that material through the respective plant from a sales document.
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