REST POST on external list 201 code but item not added

Hi everybody,

im working on some exciting project and i have a big problem.

im working on SharePoint 2013 App  that talk to an azure db via external list. All app is done with angular js an d REST API.

I created my external list on the host web following this tutorial (http://www.pointbeyond.com/2012/12/31/surfacing-data-from-sql-azure-in-sharepoint-2013-online-office-365) and when im trying to add an item in that list using rest call in app web, i have201 created code (but nothing is added on list) but when i manually create item via UI, item is added.

i have something like this in my reponse (

ists(guid'9b0a24d1-0f9d-4a0a-a745-153cd1861b6f')/GetItemByStringId(null)","type":"SP.Data.AzuretransListItem"})

code  it seems my data is not handle by the list and nothing happend.

im so confuse why sharepoint send me 201 created code but the item is not added.

Thanks a lot in advance for your responses.