Can MAPE be sent to Supply Planning on a Custom Measure?

We are testing Statistical Safety Stock planning in our supply plan. Our Demand Plan creates a Bookings Forecast and a Shipments Forecast, and we calculate the combined forecast by adding the two together (with analysis sets segregating for the organizations using the Bookings and the organizations using the Shipments Forecast.)

Only when we feed the Final Shipments Forecast, the Shipments Forecast, the Final Bookings Forecast, or the Bookings Forecast will the MAPE show in the Supply Plan for items. Is there a setting to enable MAPE to be included in custom measures in Demand Mgt for use in Supply Planning?