APO BAPI_PRDSRVAPS_SAVEMULTI2 Issue

I am using this bapi for extending the products to new location , i know the fields are in product_location_version and i have to fill the corresponding fields in product_location_version_x with 'X', but i am getting an error saying either 'product not found' or 'location not found'. I appreciate if anyone can help me with this. Its very urgent.