> But only one question because I don't understand...
>
> My problem isn't at the code(VB) level (perhaps it is a consequence!) but on odbc/table level..
>>>
>>> I'm using an Access 2000 database with Access 2003. I linked some Firebird tables via ODBC. Most tables work just fine, but there's some that give me the error "The decimal field's precision is too small to accept the numeric you attempted to add."

But one thing you should understand: the error message that you
showed doesn't belong to Firebird. It means that either you showed us
wrong message or the problem is not in Firebird.
You should really find where this error message comes from. And
whatever you said, I suspect that the source is your code or Access.

SY, SD.