problem with gnucash and postgresql

[Md. Aminul Islam Khan]

Hi,
Using Ubuntu-9.04.
Installed postgresql-9.0beta4, and gnucash-2.3.15.
Save as: Postgres -> dialogue box:
Host: localhost,
Database:
         if name contains capital letter (e.g. Finance) it gives error or
corrupt file.
         if name in all small letters (e.g. finance) database is created.

Reason?

aikhan