Online ATP update

If the ATP is to be used to support order acceptance, it must be kept up-to-date. You can choose between two methods to update the ATP:

• Online update, carried out when a planned or actual inventory transaction is recorded.
• Offline update, carried out when the item master plan is updated.

Online update of ATP

You can enable online ATP updates by selecting the Online ATP Update in EP check box in the Planning Parameters (cprpd0100m000) session.

Next, select the Online ATP Update check box in the Items - Planning (cprpd1100m000) session for each item for which you want the ATP to be updated online.

LN updates the ATP over the entire planning horizon, but only in the actual scenario.

If necessary, LN also updates the ATP of components for which you selected the Critical in CTP check box in the Items - Planning (cprpd1100m000) session, and/or the capacity CTP of the resources for which you selected the Critical in CTP check box in the Work Centers - Planning (cprpd2100m000) session.

Offline update of ATP

You can always recalculate the ATP of items manually, by updating the item master plan.

Forecast consumption

When the ATP is updated online, Enterprise Planning also applies forecast consumption. The result can differ from the normal consumption procedure during a master-plan update, because during an ATP update, the consumption always remains within the bounds of one plan period. In other words, no backward or forward consumption is used.

Plan items without an item master plan

If an item does not have an item master plan, the ATP is not stored, but is always computed online, like the ATP information in the Item Order Plan (cprrp0520m000) session.