MRP Period Calculations Using Planning Fence Rules
MRP supply-and-demand netting calculations are generated on a period-by-period basis for each MRP-defined time bucket. The requirement generation uses the planning fence rule to determine what sources of demand to consider for a given duration.
The example is based on a G planning fence rule of 20 days. The greater than rule will be applied on a period-by-period basis within the planning fence duration.
Sources of Demand |
Week 1 |
Week 2 |
Week 3 |
Week 4 |
Week 5 |
Week 6 |
|---|---|---|---|---|---|---|
Forecast |
100 |
100 |
100 |
100 |
100 |
100 |
Sales Orders |
300 |
200 |
||||
PLO |
300 |
100 |
100 |
100 |
100 |
100 |
This MRP period-by-period comparison would be more pronounced if the MRP time buckets were in days and the rule duration remained at 20 days.
Note: The planning time-fence duration
should approximate the replenishment lead time of the item.