Previous  Next          Contents  Index  Glossary  Library

ATP with Backward Consumption and Accumulation

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 4-1=3 4-2=2 4-2=2
Accumulation   2-> 2-1=1 -> 1-2= (-1)   3+2=5 -> 5+2=7 -> 7+2=9
ATP 0 0 0 -1 2 5 7 9
New Demand             3  
New ATP 0 0 0 -1 2 2 4 5

Table 1 - 23. ATP Periods, Backward Consumption with Accumulation rule (Page 1 of 1)

With this rule, demand is subtracted from supply within each period, and the remaining quantity available is carried over into the next period. Negative quantities are not carried over. Accumulation is illustrated beginning in period 2, as a quantity of 2 is carried over and added to the available quantity for period 3. This surplus from period 2 is consumed in periods 3 and 4. The negative ATP quantity in period 4 is not accumulated, giving an ATP quantity of 2 in period 5. The remaining periods continue to accumulate the period ATP quantities, resulting in an ATP of 9 for period 8.

Running the same ATP check as in the previous example, where backward consumption was the only option turned on: again, single ATP check for a quantity of 3 in period 7. ATP is 7, so adequate ATP exists to cover. Since the ATP rule is now accumulating, this yields period 7 supply less period 7 demand plus the excess quantities from prior periods available to promise. This contrasts to the two ATP rules above, period ATP and backward ATP, where the available to promise within a period is limited to the supply quantity for the period less the demand quantity for the period.

See Also

ATP with No Backward/Forward Consumption, No Accumulation (Period ATP)

ATP with Backward Consumption

ATP with Forward Consumption

ATP with Backward Consumption and Accumulation, Accumulation Window of 2 Days

Defining ATP Rules

         Previous  Next          Contents  Index  Glossary  Library