CREATE OR REPLACE FUNCTION prodqtyreserved(p_product_id numeric, p_warehouse_id numeric)
  RETURNS numeric AS
$BODY$
DECLARE
	v_Warehouse_ID			numeric;
 	v_Quantity			numeric := 99999;	--	unlimited
	v_IsBOM				CHAR(1);
	v_IsStocked			CHAR(1);
	v_ProductType			CHAR(1);
 	v_ProductQty			numeric;
	v_StdPrecision			int;
BEGIN
	--	Check Parameters
	v_Warehouse_ID := p_Warehouse_ID;
	IF (v_Warehouse_ID IS NULL) THEN
		RETURN 0;
	END IF;
--	DBMS_OUTPUT.PUT_LINE('Warehouse=' || v_Warehouse_ID);

	--	Check, if product exists and if it is stocked
BEGIN
		SELECT	IsBOM, ProductType, IsStocked
		  INTO	v_IsBOM, v_ProductType, v_IsStocked
		FROM M_PRODUCT
		WHERE M_Product_ID=p_Product_ID;
		--
	EXCEPTION	--	not found
		WHEN OTHERS THEN
			RETURN 0;
	END;

	--	No reservation for non-stocked
	IF (v_IsStocked='Y') THEN
		--	Get ProductQty
		SELECT 	-1*COALESCE(SUM(MovementQty), 0)
		  INTO	v_ProductQty
		FROM 	M_ProductionLine p
		WHERE M_Product_ID=p_Product_ID AND MovementQty < 0 AND p.Processed = 'N'
		  AND EXISTS (SELECT * FROM M_LOCATOR l WHERE p.M_Locator_ID=l.M_Locator_ID
		  	AND l.M_Warehouse_ID=v_Warehouse_ID);
		--
		RETURN v_ProductQty;
	END IF;

	--	Unlimited (e.g. only services)
	IF (v_Quantity = 99999) THEN
	RETURN 0;
	END IF;

	IF (v_Quantity > 0) THEN
		--	Get Rounding Precision for Product
		SELECT 	COALESCE(MAX(u.StdPrecision), 0)
		  INTO	v_StdPrecision
		FROM 	C_UOM u, M_PRODUCT p
		WHERE 	u.C_UOM_ID=p.C_UOM_ID AND p.M_Product_ID=p_Product_ID;
		--
	RETURN ROUND (v_Quantity, v_StdPrecision);
	END IF;
	RETURN 0;
END;
$BODY$
  LANGUAGE plpgsql STABLE
;