ATP Time Fence Options
You can specify time fences for your ATP rules to restrict the use of both supply and demand. Time fences help you filter the noise out of the ATP calculation. You can implement the following time fence options:
Past Due Demand Days
ATP does not include any demand orders with a due date before this time fence. ATP uses the number of manufacturing workdays you enter for this fence to back off from the current system date and determine the past due time fence.
Use this time fence if you have sales orders, jobs, repetitive schedules, or other demand outstanding with past due dates that you do not plan to fill from existing or planned supply. If the due dates are before the time fence, ATP does not include these orders as demand.
Past Due Supply Days
ATP does not include any supply orders with a due date before this time fence. ATP uses the number of manufacturing workdays you enter for this fence to back off from the current system date and determine the past due supply fence.
Use this time fence if you have purchase orders, jobs, repetitive schedules or other supply orders with past due dates that you do not want to rely on as a source of supply for your ATP calculations. If the due dates are before the time fence, ATP does not include these orders as supply.
Infinite Supply Time Fence
Use this time fence to specify the end of your ATP horizon. ATP considers any demand that falls beyond this time fence as available. Use this time fence as the practical lead time you need to acquire components and build any quantity that a customer may order. You can choose from the following options to determine the infinite supply time fence:
- Cumulative manufacturing lead time
- Cumulative total lead time
- Item total lead time (does not include lead time of components)
- User-defined time fence (specify the number of supply days for your rule)
Accumulation Window
If you choose to accumulate expected surplus in one ATP period to the next, you can limit this accumulation to a specific number of workdays. Oracle Inventory does not treat excess supply as available supply beyond this accumulation window. Oracle Inventory also uses this option in backward consumption calculations, preventing excess supply from a period beyond the accumulation window from covering a shortage in a future period.
You can use the accumulation window to prevent the commitment of supply to satisfy demand with requirement dates far into the future. This is particularly useful if you have an item with high turnover and would likely be able to sell it quickly.
Sample ATP Rules
The following table displays some sample ATP rules:
| Period
| No
| No
| No
| N/A
|
| Backward
| No
| Yes
| No
| NULL
|
| Backward with Accumulate
| Yes
| Yes
| No
| NULL
|
| Forward
| No
| No
| Yes
| N/A
|
| Forward with Accumulate
| Yes
| No
| Yes
| NULL
|
| Backward with Cumulative,
Accumulation Window=2
| Yes
| Yes
| No
| 2
|
| Backward-
Forward
| No
| Yes
| Yes
| NULL
|
See Also
ATP Computation Options
ATP Supply Source Options
ATP Demand Source Options
Defining ATP Rules
