| # Channel ATP A plan item that is associated with channels has a mandatory master plan. The channel ATP is therefore always checked according the master plan buckets. Therefore, the channel ATP is always stored in accordance with the scenario plan period definition. For these plan items, the Component CTP bucket field in the Planning Parameters (cprpd0100m000) session is ignored. Channel ATP is calculated for each master plan bucket in the following way based on the settings in the Plan Item - Channels (cpdsp5100m000) session. First, the actual reference date is determined in case the reference date of the Plan Item - Channels (cpdsp5100m000) session falls before the scenario start date. This can happen when the scenario has been rolled. In that case, the ATP period length, for example, 14 days, is added to the reference date until the date passes the scenario start date. This date can still be in the past. After you determine the new reference date in Step 1, the first channel date is determined. This date is the first calculated date in the present, based on the new reference date + the ATP channel period. The channel date can fall in the middle of a channel master plan period. In that case, the channel date is rounded to the start of that plan period. This procedure will continue for each subsequent ATP channel period. Cumulative channel CTP The cumulative channel ATP only applies in each ATP period length, starting with zero. The calculation is:
    Channel ATP = Demand (sales orders) + Receipts (Allowed demand)
    		- Deliveries (sales deliveries)
As a result, a sales order only consumes the cumulative channel ATP in the ATP period length in which the sales order falls. Other periods are not impacted. This procedure is carried out because the cumulative channel ATP is reset to zero at the start of each ATP period, therefore, the cumulative channel ATP of previous periods is not included and can still be promised. Note The cumulative channel ATP is always limited by the plan item’s central CTP. This additional check is performed because the channel ATP can be increased by means of the allowed demand manually. The ATP period length can also be set extremely wide, and a channel might not consume its channel ATP for a long time. As a result, when the channel ATP becomes greater than the item’s central CTP, the user cannot promise more than this CTP quantity. |