01 and 02 are the checking group. Availability check is carried out with the help of these checking group and checking rule. Checking group 01 and 02 are maintained on the material master.

01 - Individual requirement -For this system generates transfers the requirement for each order to the MRP .So that MM can either produce or procure.

02- Collective requirement.-In this all the requirements in a day or in a week are processed at a time.

System stores all requirements and passes on to the MRP in MRP run. In this system performance is high. However you cannot do the back order processing whereas in other you can do.

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