Here you can indicate whether you want the program to automatically calculate an MPS/MRP plan in one step. To do so, click the field to insert a check mark. Then when you open the Calculate Plan - Plan. Wksh. batch job from the Planning Worksheet window, both the MPS and MRP fields will already be checked. (If you want to, you can remove one of the check marks.)
If you leave the field blank, you can select either MPS or MRP on the Calculate Plan request form window. However, you cannot select both.