ATP Computation Options
You can choose a variety of computation options to suit your business needs. ATP computations use the consumption and accumulate available features. Consumption resolves negative ATP after it is already determined that there is not enough available inventory. Accumulation uses excess inventory from a period to determine where new demand can be placed. You can choose any combination of the following options:
Accumulate Available
This option determines how the ATP calculation uses a period's excess quantity. If you select this option, ATP carries forward the available quantity from prior periods, making it available for future periods when demand exceeds supply. You must have Backward Consumption turned on to use the Accumulate Available option.
Most ATP users turn this option on. Turning this option off may be appropriate if your items have a short shelf life, or you want to leave quantity available in each period for short lead time orders.
Backward Consumption
This option determines if the ATP calculation can look to previous periods to match existing demand to a supply. If you select this option, ATP checks prior periods for availability if a period has insufficient supply for existing demand.
Most ATP users turn this option on and use it with Accumulate Available. With these options, ATP matches existing supply and demand period by period. If a period has insufficient supply, ATP checks prior periods, and matches demand to the excess supply of a prior period. With accumulation also turned on, ATP accumulates available quantities over multiple prior periods if necessary to meet existing demand.
Forward Consumption
This option determines if the ATP calculation can match existing demand to supply in future periods. If you select this option, ATP checks future periods for availability if the period supply is insufficient for an existing demand.
Combination of ATP Options
You can select more than one of the computation options. By combining options, you can create an ATP rule that best meets your needs. Some points to consider when selecting your ATP computation options:
| Backward consumption only
| ATP calculates availability for your item period by period. If the available supply quantity for the period does not meet the existing demand for that period, ATP works backward, period by period, and checks if the available supply within each period is sufficient to meet the excess demand. ATP does not combine the available quantities from multiple periods to meet an existing demand.
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| Backward consumption and accumulate available
| ATP accumulates the excess supply from period to period. When demand in a period exceeds supply, this accumulated quantity is dipped into and reduced. When you perform an availability check, the accumulated quantity is available for your demand.
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| Forward consumption and backward consumption
| ATP consumes backwards first. If the available supply quantity for a period is not enough to meet the period's demand, ATP steps back period by period to try to satisfy demand. If the demand cannot be met, ATP then moves forward into future periods to check on available supply.
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Keep in mind that the ATP rule applies to existing demand and supply, and determines the quantity available on a period by period basis. Your quantity check is done against the results. ATP does not try to forward consume or backward consume your ATP check quantity.
See Also
ATP Time Fence Options
ATP Supply Source Options
ATP Demand Source Options
Defining ATP Rules
