Hi Sir,
try below query
SELECT sum (T0."InQty")- sum(T0."OutQty") FROM OINM T0 WHERE T0."ItemCode" = $[@STATIONROW.U_Product] and T0."Warehouse" = $[@STATIONROW.U_STATION]
and TO_DATE(T0."DocDate") < (select TO_DATE($[@STATIONROW.U_DATE.DATE]) from dummy)
regards,
Raviraj