To encourage our customers to order at quieter times of the year we offer pre-season large order deals. We enter forecasts for the month of shipment for these pre-season orders (on top of our business as usual forecasts). We usually want to build the pre-season orders a month before they are shipped, so manually move the job a month earlier than suggested by MRP so that material purchasing suggestions are generated in time for the job . We have tried moving the pre-season forecast a month earlier instead but this causes problems with under/over ordering as the forecast is only consumed when the order is shipped.
Does anyone else have a similar issue with timing orders, forecasts and shipments when you build early? If so, how do you manage it?