For Select Do doesn't work

I have written the following procedure:

SET TERM #;

CREATE PROCEDURE Get_All_Drivers_For_ALS
RETURNS( id varchar(8))
AS BEGIN
EXIT;
END #

ALTER PROCEDURE Get_All_Drivers_For_ALS
RETURNS( id varchar(8))
AS BEGIN
FOR SELECT MST_ID FROM MASTER WHERE(DPT_NO <> 1) INTO :id DO
BEGIN SUSPEND; END
END #

SET TERM ;#

Running this (in the MITEC IB Query developer) gives an error on the : of the INTO :id statement.
It seems this statement or the variable is not recognized. Does someone know why?

Found it.

Although all documentation I found on the net said that I should put a ':' before the variable, Mitec doesn't want that.
So, after skipping the : before the id, it works fine.