Azure Mobile Services - Duplicate item after synchronization

I am using Azure Mobile Service as a backend for an iOS application. I have set up everything to work with offline sync which allows me to view, add, or modify data even when there is no network connection. I am running into a problem when I add a new object into a table. The add works well locally but when I synchronize data it creates a duplicate item on the local database with a slightly different objectId. The created item is not duplicated on the server side.

Here's how I am setup. By the way, thanks to @TheBasicMind for posting this model.

Here's a link to his explanation of the model: enter link description here

Here's what I do to setup the sync context and sync table:

 // Initialize the Mobile Service client with your URL and key MSClient *client = self.hpc.client; NSManagedObjectContext *context = self.hpc.syncContext; MSCoreDataStore *store = [[MSCoreDataStore alloc] initWithManagedObjectContext:context]; client.syncContext = [[MSSyncContext alloc] initWithDelegate:syncDelegate dataSource:store callback:nil]; // Add a Mobile Service filter to enable the busy indicator self.client = [client clientWithFilter:self]; // Create an MSSyncTable instance to allow us to work with the Athlete table self.syncAthleteTable = [self.client syncTableWithName:@"Athlete"]; 

Here's how I add a record for the moment:

NSDictionary *newItem = @{@"firstname": firstname, @"lastname": lastname, @"laterality" : laterality}; [self.athletesService addItem:newItem completion:^{ NSLog(@"New athlete added"); }]; -(void)addItem:(NSDictionary *)item completion:(CompletionBlock)completion { // Insert the item into the Athlete table [self.syncAthleteTable insert:item completion:^(NSDictionary *result, NSError *error) { [self logErrorIfNotNil:error]; // Let the caller know that we finished dispatch_async(dispatch_get_main_queue(), ^{ completion(); }); }]; } 

The add works as expected and it is added in a UITableView as I have an NSFetchedResultsController listening on my Main Context.

Here's where the problem occurs. When I synchronize data with the server using this function:

-(void)syncData:(CompletionBlock)completion { // push all changes in the sync context, then pull new data [self.client.syncContext pushWithCompletion:^(NSError *error) { [self logErrorIfNotNil:error]; [self pullData:completion]; }]; } -(void)pullData:(CompletionBlock)completion { MSQuery *query = [self.syncAthleteTable query]; // Pulls data from the remote server into the local table. // We're pulling all items and filtering in the view // query ID is used for incremental sync [self.syncAthleteTable pullWithQuery:query queryId:@"allAthletes" completion:^(NSError *error) { [self logErrorIfNotNil:error]; [self refreshDataOnSuccess:completion]; }]; } - (void) refreshDataOnSuccess:(CompletionBlock)completion { MSQuery *query = [self.syncAthleteTable query]; [query readWithCompletion:^(MSQueryResult *results, NSError *error) { [self logErrorIfNotNil:error]; NSLog(@"Data that pulled from local store: "); for ( NSDictionary *dict in results.items ) { NSLog(@"%@ %@", [dict objectForKey:@"firstname"], [dict objectForKey:@"lastname"] ); } // Let the caller know that we finished dispatch_async(dispatch_get_main_queue(), ^{ completion(); }); }]; } 

After the synchronization the NSFetchedResultsChangeInsert is called a second time for the same record with a slightly different objectID. Here's an example of the first and second objectIDs: tD7ADE77E-0ED0-4055-BAF6-B6CF8A6960AE9
tD7ADE77E-0ED0-4055-BAF6-B6CF8A6960AE11
I am stuck here.

Any help is highly appreciated. Thank you!