Searching on a boolean with a 1-1 association

I've got 2 objects, Lead and Source, with a 1-1 association between them (Lead_Source). I have a datagrid of Lead and I want to create a searchfield with a boolean attribute on Source, but I am unable to select this attribute. I could replace the boolean with an enum (which are selectable), but I was wondering if anyone has any insight on why the boolean cannot be selected.
1 answers

Right, this apparently isn't possible. You should do a feature request / bug report.