Trigger reference table error

[Luis Gasca]

Using 5.0.12 (windows)

Referencing a table within the trigger fails, although it is supposed to be working from 5.0.10

example:

create trigger counters before update on mt
for each row
begin
DECLARE xidg integer;

SELECT idg INTO xidg FROM mt_group WHERE pkfield=NEW.route
SET NEW.idg = xidg;
end//

NEW.idg contains NULL.

I have also tried with user (@) variables. Same result.

Any hints ?
Thanks
luis