# MPS/MRP Control Parameters (PLAN.CONTROL)
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PLAN.CONTROL is used to specify which planning groups are available to the system. Planning groups allow you to process MRP, MPS, CRP and other inventory and production functions independently from one another. You also define the size and number of periods to be used when generating the MRP and MPS horizontal reports. You specify the number of periods by entering the number of days for each period. You can also limit the types of sales orders to be included in processing, and indicate if status "N" (new) work order's schedule dates are firm or variable.
Frequency of Use
Typically when first seeting up the system, or when changes or additions are required.