EXP_0037

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Forecast-based planning is oriented towards material consumption. By means of the forecasting tools, forecast values are determined for future requirements based on past values. These forecast values form the requirement values for the material requirements planning run.
The forecast requirement is reduced by the withdrawal. This ensures that the part of the predicted requirement which has already been realized is not planned again.
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If a vendor always delivers a material on a certain weekday then it makes sense to plan this material according to the same cycle, adjusted to the delivery date. This is made possible with the time-phased materials planning procedure.
As in forecast-based planning, the forecast in time-phased materials planning predicts the requirement for the following periods. Forecast-based planning differs from time-phased materials planning due to the planning cycle: materials which are planned according to a time-phase are only planned for certain dates. 
Materials which are planned according to a time-phase are provided with an MRP date in the planning file. This date is reset on the creation of a new material master record and later after every planning run. This date corresponds to the day on which the material will next be planned; it is calculated on the basis of the specified planning cycle in the material master record. With materials which are planned according to a time-phase, the total change indicator and the net change planning indicator are of no importance to the planning file; therefore they are not set when changes relevant to planning are made.
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In reorder point planning, procurement is always triggered when the sum of warehouse stock and fixed receipts falls short of the so-called reorder point. The reorder point should cover the expected average material requirements during the replenishment lead time. The safety stock should cover both excess material consumption during the replenishment lead time as well as the additional consumption caused by delayed deliveries. The safety stock is therefore part of the reorder point. 
With automatic reorder point planning the reorder point and the safety stock are automatically calculated in the forecast run.
On the basis of previous material consumption values the system determines the forecast values for future requirements. The reorder point and the safety stock are calculated from these values. These are independent of the service level determined by the MRP controller, and of the material replenishment lead time. They are then transferred into the respective material master record.
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