SetIapId () problem ?

Hi all!
I'm using TCommDbConnPref to override the connection settings but I've found a problem.
I've got 4 access point configured in my phone.
I use:
User::LeaveIfError(iConnection.Open(iSocketServ));
connectPref.SetDialogPreference(ECommDbDialogPrefDoNotPrompt);
connectPref.SetDirection(ECommDbConnectionDirectionOutgoing);
connectPref.SetBearerSet(ECommDbBearerGPRS);
connectPref.SetIapId(ap_id);

This works perfect, but.. always the connection is made with the wrong AP!, if I select AP_ID = 3, the connection is made with the connecon ID = 4
it is very strange.
I checked this with 2 diferents phones and is always the same.
I tried with SetIapId(3) and nothing, the connection used was the iapid 4
If I use SetIapId(4) the connection used is which has id=5

The phone Ap Ids are: 2,3,4,5
I debuged all this during two days and I couldn`t find the problem.

Someone could check it?
This is a bug?
Am i doing somthing wrong?

Thank you very much
mopa