> In this moment, I am using Delphi 4 C/S.
>
> What can I do in D4 C/S?

It should be similar to what I previously described. I just did a
search of my BCB4 installation (uses the same VCL version as D4). It
did not have dsdefine.pas anywhere, however a search of the lib
directory finds reference to both FieldsRegisterProc and dsdefine in
dcldb40.bpi (and dcp).

So you should still be able to add dsdefine to the IB_Registration
uses clause and/or dcldb40 to the requires clause of the package.

HTH

Geoff Worboys
Telesis Computing