Thank you Helen,

I use firebird dialect1 and delphi3. I have tried both double
precision and numeric(15,2) field definitions.

I've tried all the things you have written. Unfortunately I coundn't
make it. I have tried something stupid like entering a value like
10...........20 and it was written as 1020 to the database. I've
verified this from dbexplorer. There's nothing in the code modifying
data that will be written. Just the grid and the other components.
(by the way, can I get the proper value before I press the enter key
in the grid and post it manually?)
I think i will be using a stringgrid and updating manually :(