DBLookupcombobox sometimes doesn't work

Hi all,

Does anyone know why using numeric values in a DBLookupcomobox won't
work while string values do work ?  That is, i can browse through the
(numeric) values but when i type a value nothing happens.

I connect to a SQLA -database (Sybase) using Delphi 3.02 Client Server.

Any suggestions ?

Thanks.