Understanding the Customer Address Relationship Setup
To use the forecast consumption by customer functionality, you have to be able to match forecast and sales order records by a common customer number. Because sales orders have two applicable address book numbers, sold to and ship to, you have to define which number the system uses to match a sales order to a forecast.
You can use the Forecast Consumption Customer Address Relationship program (P3406) to define whether the system uses the sold-to or the ship-to address when searching for sales orders. You can set up the relationship for the customer only, or you can set it up for a combination of item and customer.
When running MRP/MPS Requirements Planning or Master Planning Schedule - Multiple Plant, you can set a processing option that determines whether the system uses the sold-to or the ship-to number to search for sales orders. This processing option is used if no customer address relationship is set up in the F3406 table.