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I have a site collection with Persian language. so lists and fields are in Persian.
When i create a console application and add reference to listdata.svc, i can use the DataContext and add items to a sample list.
But when im in wcf service project and use the same codes and configs, it won't work.
inner exception message is:

Error processing request stream. The property name 'ایجادشده' specified for type 'Microsoft.SharePoint.DataService.ParnianQueueListItem' is not valid.

'ایجادشده' field is the same "Created" field in SharePoint Lists.
exception message is:

System.Data.Services.Client.DataServiceRequestException was unhandled by user code  
  Message=An error occurred while processing this request.  
       at System.Data.Services.Client.DataServiceContext.SaveResult.HandleBatchResponse()  
       at System.Data.Services.Client.DataServiceContext.SaveResult.EndRequest()  
       at System.Data.Services.Client.DataServiceContext.SaveChanges(SaveChangesOptions options)  
       at Parnian.NotificationService.Srv.WcfNotifyMainClassService.AddItemToQueueList(QueueItem item, String configKey)  
       at SyncInvokeAddItemToQueueList(Object , Object[] , Object[] )  
       at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)  
       at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
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I finally figure it out.
I just disabled Anonymous Authentication in "_vti_bin" folder of a SharePoint site in IIS which by default it's Enabled.
I actually don't know how it could be related!.

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This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. – John Chapman Oct 16 '12 at 17:23

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