Requisition refers to a way to requesting goods or services in written form. In general case, when a requisition is generated that means finally a request has been finally made and certain actions are expected to follow after that. The process of requisition is formal and method which is used to track of and accounting every request is standard. Now most of the organizations are accepting requisitions in digital format. So that it can be possible for both customer and organizations to track request including associated inventory. 

A formal way of requisition will result more efficiently. It will also increase the accountability through all the points of contact.