Basic Date Scheduling: MRP Run calculates only basic dates for the orders and in-house production time specified for the material is used.
Lead Time Scheduling: MRP does lead time scheduling and calculates planned order dates based on routing/master recipe times.
Basically, it does backward scheduling starting from requirement date minus GR processing times, in-house production time, float time before production, float after production, etc., and calculates the duration of planned orders.
The routings/master recipes are read to schedule and calculate the capacity requirements on work centers.
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