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In the above example, a periodic forecast exists for 20 on the 2nd, the first day of the period. When you place sales order demand for 25 on the 12th (assuming it is in the same period), the forecast consumption process attempts to consume in the period of the sales order only, since the forecast is stated in periodic buckets and no backward consumption days exist. Since there is a forecast in the period starting on the 2nd, the entire forecast of 20 is consumed by the sales order for 25 and the remainder of the sales order becomes an overconsumption of 5.

In the above example, a periodic forecast exists for 20 on the 2nd, the first day of the period. When you place sales order demand for 25 on the 12th (assuming it is in the same period), the forecast consumption process attempts to consume in the period of the sales order line schedule date first and then backwards for the number of backward consumption days.

In this example, the backward consumption days does not cause the consumption process to go into another periodic bucket. It behaves the same as if there were no backward consumption days. Since there is a forecast in the period of the 2nd, the sales order for 25 consumes, and the remainder of the sales order becomes an overconsumption of 5 on the 12th. However, if the backward consumption days are large enough to carry forecast consumption into the previous period, forecast consumption can consume any forecasts in that period also.

Attention: When you have a mix of daily, weekly, and periodic forecast entries, forecast consumption first consumes the daily entries, then the weekly entries, and lastly the periodic forecast entries that are included in the time fence created by the backward and/or forward consumption days.