calling a function from a procedure pl/SQL

CREATE OR REPLACE
PROCEDURE createorderitem(p_orderid number,p_itemid ITEM.itemid%TYPE,qty NUMBER) IS
-- procedure to create an order item for specifi orderid and custid

v_orderid	NUMBER;
v_itemid	ITEM.itemid%TYPE;
v_QTY		NUMBER;

INVALID_ORDER_ID EXCEPTION;

BEGIN

	SELECT orders.orderid INTO v_orderid
	FROM orders
	WHERE p_orderid=orders.orderid;

	IF SQL%NOTFOUND THEN
		RAiSE INVALID_ORDER_ID;
	END IF;


	SELECT item.itemid INTO v_itemid
	FROM item
	WHERE p_itemid=item.itemid;		

	IF SQL%NOTFOUND THEN
		RAiSE INVALID_ITEM_ID;
	END IF;


INSERT INTO orderitem
VALUES (v_orderid, v_itemid, qty, getprice(v_itemid));


EXCEPTION
	WHEN INVALID_ORDER_ID THEN
	dbms_output.put_line('INVALID ORDER ID');

	WHEN INVALID_ITEM_ID THEN
	dbms_output.put_line('INVALID ITEM ID');


END createorderitem;
/