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Periods | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
---|---|---|---|---|---|---|---|---|
Total Supply | 6 | 4 | 2 | 4 | 8 | 4 | 4 | 4 |
Total Demand | 6 | 2 | 3 | 6 | 6 | 1 | 2 | 2 |
Projected QOH | 0 | 2 | 1 | (-1) | 1 | 4 | 6 | 8 |
Period ATP | 6-6 | 4-2=2 | 2-3= -1 | 4-6= -2 | 8-6=2 | 1 | 2 | 2 |
Backward Consume Period 3 | 2-1=1 | <- -1 | -2+1 | |||||
Backward Consume Period 4 | 1-1= 0 | <-- | <- -1 | |||||
ATP | 0 | 0 | 0 | -1 | 2 | 3 | 2 | 2 |
New Demand | 3 | |||||||
New ATP | 0 | 0 | 0 | -1 | 2 | 0 | 2 |
Table 1 - 22. Backward Consumption ATP (Page 1 of 1) |
ATP check for a new order, quantity of 3 in period 7: ATP shows insufficient quantity to promise to meet this demand for the requested date. Instead, ATP returns an earliest ATP date of period 6. We can place new demand for period 6. After placing this new demand, ATP for period 6 shows zero.
Note that the ATP check showed the projected quantity on hand for period 7 is more than enough to meet demand. But this quantity comes from a build-up from prior periods. The ATP rule says not to accumulate available quantities. ATP for period 7 is period 7 supply less period 7 demand, giving an available to promise of 2.
ATP with Backward Consumption and Accumulation
ATP with Backward Consumption and Accumulation, Accumulation Window of 2 Days
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