APEX

I've created a checkbox LOV as follows:
select null, 'Y' from dual

When I use this checkbox w/ the default value being null all works well. The default is only shown at the start, and if the box is checked it is shown checked.

But when I set the default value to Y, it always shows up a checked on the form, even if the column value was null.

Any suggestions?

Here is some related information:
Default Value Type: Static Text with Session State Substitutions

Thanks!
-Erik