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Determining Capacity Requirements 
In the second step of lead time scheduling, the capacity requirements for the order are calculated and scheduled.
You have set the Cap. reqmts indicator in Customizing for MRP, in the IMG activity Define scheduling parameters for planned orders. This creates capacity requirements at the Scheduling Levels with which you would like to carry out scheduling.
The capacity requirements are calculated for an operation using the formulas that are maintained for the capacity categories on the capacity overview screen of the work center. The dates of calculated capacity requirements correspond to the dates of the operation.
For more information, see the <PP - Capacity Planning> documentation in the SAP Library.
