Forecast Look Behind
This field applies to MRP and APS.
The parameter lets you set the number of days into the past to look for forecasts to be consumed by customer orders during a run of MRP Planning or APS Planning. When a customer order is entered in order entry, the system looks this number of manufacturing days into the past (earlier than the customer line item due date) for forecast orders to be consumed by the customer order.
The system uses the Forecast Look Behind field on the Planning Parameters form only if this same field is not entered on the Product Codes form.
Set this parameter only as large as you need it; setting it too large has a tendency to carry forecast demand deep into the forecast period even when the likelihood of the orders coming in so late in the period is diminishing.
See Forecasting Overview for a description of how this parameter affects the planning of forecasts.