Sometimes, due to resync mecanism of the TDataset, you can get a 'Record not
found' error (especially after filtering & ordering).

Is raised in TIBODataset.GetRecord(<Buffer>, gmCurrent, ... ) when the
cursor is at the one of the edges of the InternalDataset's buffer (see
source).

Fortunatelly is easy to fix this:

procedure TIBODataset.Resync( Mode: TResyncMode );
begin
// It is important to prevent the Resync() process from being interrupted.
if Active then
begin
InternalDataset.BeginCallbackFreeze;

{Begin added code}

if Bof then Next;
if Eof then Prior;

{End added code}

try
inherited Resync( Mode );
finally
InternalDataset.EndCallbackFreeze;
end;
end;
end;

HTH

Perhaps Jason can add this in a next (sub)release.