Hallo Elmar,

> I took a bigger project and changed a TIB_Query to my TIBGridQuery.
> Here in the doBeforeClose i get an error 335544374 "Internal Schema
> Cache Error" in IB_components line 14518.

maybe there is sth. changed in newer IBO versions. I still work with IBO
4.3.Aa

Here is my declaration:

procedure TIBP_Query.DoBeforeOpen;
begin
inherited DoBeforeOpen;
if IB_Connection is TIBP_Connection then
with TIBP_Connection(IB_Connection) do
if Assigned(FBeforeIBPQueryOpen) and not FDisableProfiles then
FBeforeIBPQueryOpen(self);
end;

procedure TIBP_Query.DoBeforeClose;
begin
inherited DoBeforeClose;
if IB_Connection is TIBP_Connection then
with TIBP_Connection(IB_Connection) do
if Assigned(FBeforeIBPQueryClose) and not FDisableProfiles then
FBeforeIBPQueryClose(self);
end;

HTH.

--
Andreas