PIR : Planned Independent Requirements are planned production or sales quantities that are based on some sort of forecast procedure (e.g. Material Forecast or SOP procedure). These values are used in MRP to calculate procurement and production quantities for a material. As the name suggests, PIR is not dependent on any requirement. We use T-code MD61 for maintaining the quantity based on the forecast (Past history and future trend). It is mainly used in MTS scenario
CIR : In Customer independent requirement the customer details are not required, only details like date and requirement type are required and when planned order gets created has assigned to the CIR and the material you receive to Stock goes to special stock E. it is created by using T-code MD81 and It is mainly used in MTO scenario. The customer requirements that you create in MD81 have the same requirement as the customer order created in VA01. This option is mainly used to simulate or when you don’t have the SD module.
