fallo en trigger

[huesos52]

Código sql:

delimiter &&
CREATE TRIGGER tvp_scon BEFORE INSERT ON pos_tpv 
 FOR EACH ROW BEGIN 
IF NEW.did = 0 THEN 
  UPDATE pos_stock SET cta =cta-NEW.cta WHERE (pid, LOCAL) = (NEW.pid, NEW.LOCAL); 
ELSEIF NEW.did = 1 THEN 
  UPDATE pos_stock SET cta =cta+NEW.cta WHERE (pid, LOCAL) = (NEW.pid, NEW.LOCAL); 
END IF; 
END&&
delimiter ;
 

así?