Electronic Data Interchange is the transfer of information electronically between a customer and a vendor (or vice versa). Automotive suppliers have specialized EDI reporting requirements which often includes releases from a pre-defined forecast that is constantly updated. These forecasts are transmitted using an EDI 830 planning forecast document type which includes the firm quantities of the item the customer is authorizing to be released from the forecast. It also typically includes updates to the forecast beyond the authorized release dates. Automotive ERP systems must handle these transactions by updating the forecast with the authorized quantities for MRP planning while adjusting the cumulative forecasts for future planning periods. A few automotive suppliers  must also support 862 and 866 EDI transactions. The 862 shipping schedule provides more detail to the 830 with shipment information from the customer to the vendor. The 866 production sequence tells the supplier what VIN (vehicle identification numbers) to include in the production of VIN-stamped parts. In some cases, suppliers may load trucks in reverse VIN order so that they are in sequence when delivered to the automotive assembly plant and ready for instant use on the production line. Automotive suppliers must also utilize many other general EDI documents including 810 invoices, 850 purchase orders, 856 advance ship notices, and 997 functional acknowledgements (among other types of documents).