SAP BW: Differentiating between invoicing plant and delivering plant in sales-controlled sales planning

Sales-controlled sales planning is based on a combination of scheduled materials/quantities/probabilities from a feeder system with figures from the operational ERP system (sales/orders) in order to maintain planning over a period starting in the current year and stretching several years into the future. The department wants to be able to differentiate between the invoicing plant and the delivering plant when planning.