i start project using CDS + IBX project in D7 + ibx7.05

i read many paper and info in boralnd about it i call with some user in
world about it,many of it report same problem,i use many code for resolving
this problem . at lastest i read this article in borland :
http://info.borland.com/midas/papers/clientdataset/

quote of above :

"using Master/Detail Queries, you cannot cache detail records from different
master records.
  a.. Inserting records in detail tables is not possible without changes to
the VCL.
  b.. Cached updates with non-live queries require use of TUpdateSQL,
whereas ClientDataset can handle this natively.
Version 3.01 and above of Delphi corrects some of the problems associated
with the first two bullets above; however, there is still one major
limitation to using cached updates. Due to the way cached updates are
implemented, you must apply the updates any time you move from a master
record. This effectively means that your transactions and updates must occur
on one batch of master/detail records. This may suit your needs, and if it
does, you can use the following code written by Mark Edington of Borland.
Attach the code in Figure 5 to the BeforeClose event of the detail table. "

i think not yet solve !. i think it  have major problem in update use IBX +
provider + CDS

i have 5 masterdetail db in my project i get frequnly error :

error when call applyupdate when DisableControl

update true when applyupdate  with new insert but when edit field not update

many of code work in simple project but when use in project with  many
master detail see diffrent responce

//--------------------------------------------------------------------------
----------
// Code 1 :
 cdsMaster.CheckBrowseMode;
  cdsDetail.CheckBrowseMode;
  {Setup the variant with the changes (or NULL if there are none)}
  if cdsMaster.ChangeCount > 0 then
    MasterVar := cdsMaster.Delta else
    MasterVar := NULL;
  if cdsDetail.ChangeCount > 0 then
    DetailVar := cdsDetail.Delta else
    DetailVar := NULL;
  {Wrap updates in a transaction. If any step gives an error, raise}
  {an exception, which will Rollback the transaction.}
  {This would normally be done on the middle tier, i.e.:
      SocketConnection.AppServer.ApplyUpdates(DetailVar, MasterVar);}
  Database.StartTransaction;
  try
    ApplyDelta(cdsMaster, MasterVar);
    ApplyDelta(cdsDetail, DetailVar);
    Database.Commit;
  except
    Database.Rollback
  end;
  {If previous step resulted in errors, Reconcile error datapackets}
  if not VarIsNull(DetailVar) then
    cdsDetail.Reconcile(DetailVar) else
    if not VarIsNull(MasterVar) then
      cdsMaster.Reconcile(MasterVar) else
      begin
        cdsDetail.Reconcile(DetailVar);
        cdsMaster.Reconcile(MasterVar);
        cdsDetail.Refresh;
        cdsMaster.Refresh;
      end;
//--------------------------------------------------------------------------
-------------------
code 2 :

var
  BKMU , BKMI : TBookmark;
begin
  BKMI := CDBWI.GetBookmark;
  BKMU := CDBWUS.GetBookmark;
  try
    CDBWI.DisableControls;
    CDBWUS.DisableControls;
    Screen.Cursor := crSQLWait;
    if CDBWUS.ApplyUpdates(-1)=0 then
      CDBWUS.Refresh;
  finally
// Do this first !!!!!
    CDBWUS.GotoBookmark(BKMU);
    CDBWI.GotoBookmark(BKMI);
// Then enable controls
    CDBWUS.EnableControls;
    CDBWI.EnableControls;
    Screen.Cursor := crDefault;
  end;
//--------------------------------------------------------------------------
----------------
code 3 :

var
  BKMU , BKMI : TBookmark;
begin
  BKMI := DetCDS.GetBookmark;
  BKMU := MasCDS.GetBookmark;
  try
    Screen.Cursor := crSQLWait;
    if (DetCDS.State in dsEditModes) then begin
      //DetCDS.DisableControls;
      DetCDS.Post ;
      //BIE := True;
    end;
    if (MasCDS.State in dsEditModes) then begin
      //MasCDS.DisableControls;
      MasCDS.Post;
      //BUE := True;
    end;
    DetCDS.DisableControls;
    MasCDS.DisableControls;
    if (MasCDS.ChangeCount > 0)then
      MasCDS.ApplyUpdates(0);
    MasIBDT.Close;
    MasIBDT.Open;
    MasCDS.Refresh;
  finally
    MasCDS.GotoBookmark(BKMU);
    DetCDS.GotoBookmark(BKMI);
    MasCDS.EnableControls;
    DetCDS.EnableControls;
    Screen.Cursor := crDefault;
  end;
end;

//--------------------------------
;-(