oracle forms 6i problem

Hi i'm an oracle forms newbie...

i'm trying to get data from an Immigration table into certain select fields depending on the passport no entered into a textfield

here's the form trigger code (activated on when_press_button)
the block name is Immigration, the table in the database is also called Immigration
***
select sin into :immigration.SIN
from Immigration
where passport = :immigration.Sfield;
***
immigration.Sfield is the search field.

when compiling the code however it says the table Immigration is an undeclared identifier....i've checked the letter cases..they are correct.

plz help. Thanks

The problem may be with the connection to the database , just check whether you are connected to the same database which contains that table Immigration.