Schedule Margin Key in Production Scheduling

While "Basic Scheduling" in MRP... Scheduling margin key is not considered. It takes the "In house production" days for fixing up the start date. This is only exact to "days".
Lead Time scheduling is carried out on request from the scope of MRP. Target dates are calculated from routing and Capacity requirement calculations are also done. The calculations are exact to the seconds (time).
SCHEDULING MARGIN KEY takes effect only for Lead Time Scheduling. For this you have to configure for "scheduling horizon" to limit the period for which lead time scheduling and capacity planning should be carried out. scheduling horizon is the period in working days. If a planned order has its basic start date within this period in future, lead time scheduling is carried out using the selected routing. The production times are calculated from the float times of the scheduling margin key in the material master record and the time from the individual operations. If the planned order has its basic start date further in the future than this scheduling horizon, the basic dates are calculated from the in-house production times in the material master and are transferred to the production times.