PIR Vs CIR

Hi Team,

I am creating forecasts (ie, PIR) in MD61. The PIR will be generated for a material, plant, requirements type, version & planning horizon.

In t.code MD81 (Customer indepependent requirements-CIR), we can create CIR.

Q1: What is CIR? In which business scenario the CIR will be created?

Q2: How the CIR is different from Sale order? In which business scenario the CIR will be created instead of creating the sale order?

Q3; How the CIR & PIR are different? Can anyone explain with some example.

Thanks