Wrong ?

CREATE PROCEDURE SP_INC (
SUCUR INTEGER,
INCREMENTO DECIMAL (2, 2))
AS
BEGIN
if (incremento <> 0) then

BEGIN
UPDATE SUC_ART SET PRECIO=PRECIO*:INCREMENTO
WHERE ID_SUC= :SUCUR ;
SUSPEND;
END
END

I must run a store procedure than update al the recordos from a
SUCURSAL and increment the PRICE (PRECIO) with a PORCENT
I don't know whats wrong with this?