fragments startActivityForResult always return resultCode 0 and intent null on callback onActivityResult

fragments startActivityForResult always return resultCode 0 and intent
null on callback onActivityResult

I searched all over and there are similar posts about it, but can't find a
solution!
My situation is I have an Activity A that holds a fragment, and from that
fragment I want to start a new Activity B that should return some values
to the fragment.
On the fragment
startActivityForResult(mapIntent, ConstantsUtils.TOMAP_REQUEST_CODE);
On the Activity B, to return the data
Intent returnIntent = new Intent();
returnIntent.putExtra(SerializationConstants.isSearchSaved,
mAbItemsShown.ordinal());
setResult (ConstantsUtils.SUCCESS_RETURN_CODE, returnIntent);
finish();
On the fragment
@Override
public void onActivityResult(int requestCode, int resultCode, Intent
intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch (requestCode) {
case ConstantsUtils.TOMAP_REQUEST_CODE:
if (resultCode == ConstantsUtils.SUCCESS_RETURN_CODE) {
//do some stuff
}
}
}
onActivityResult from the fragment is successfully called, with the right
requestCode but resultCode is always 0 and intent is always null
I have no other onActivityResult implementation under Activity A
In fact, I also try starting the activity from the fragment with
getActivity().startActivityForResult(mapIntent,
ConstantsUtils.TOMAP_REQUEST_CODE); and implementing onActivityResult on
Activity A but it happens the same, right requestCode but wrong resultCode
and intent
I'm using Sherlock Action Bar so my fragment is a SherlockListFragment so
I'm using the support library (r18)
Can you help me? Thanks