Hello devart team,

Try to filter an IbcQuery  (latest release) with firebird 5.0 :

IbQuery1.Filtered :=False;

IbQuery1.Filter :=  Substring( MyField from 1 for 5)  = 'Hello'

IbQuery1.Filtered :=True;

This rise an error :  "Substring is an unknown  Field"

(Something like this).

With Delphi ClientDataset that was worked fine !

Thx