The reason why is because 'type' is a reserved keyword in Firebird. Unfortunately, das_account uses this column internally. Replacing this would involve adding double quotes around any reserved keywords, which is just plain icky. I know there's different behaviours for Oracle, Solid and MSSQL, but the prospect of adding a Firebird module doesn't appeal.

More information on Firebird reserved words here and here.

Update: Duh. I can change the name of the column. It's repository backed.