ODBC with fields defined as numeric(14,2)

 Hello. I have problem with accesing fields defined as NUMERIC(14,2) 
from Wndows applications.
I use ODBC v. 6.5 and Postgresql 7.0b5 (I'm also using Borland Builder 
5.0).
When reffering fields defined as numeric Builder generate code like

SELECT COUNT(*)  FROM "mir" WHERE "liczba"=34.50

(I've checked postgresql log file).
Postgresql complains about missing operator = (numeric, float8).

Any ideas how to fix this ????

Mirek Hankus