Where is backend table of demand plan mapped and stored for shipment history and forecast ?

Demand planning data- How to know in which backend tables store data. Where can we get the mapping of the front end and back tables.

Final Shipment history& Final Shipment forecast data in demand planning is not matching with the below table's for item. Please suggest the way to find out the exact backend tables mapped to demand planning data from front end.

fusion.msc_measure_data,msc_measure_data,MSC_PLAN_ORGANIZATIONS,MSC_ITEMS,msc_measures_tl