title: Storage issue in core data _NSFaultingMutableSet while storing relations
body: <p>I have a modal, </p>
  
  <p>xsdContact (NSString name, xsdListOfAddresses ListOfAddresses)<br>
  xsdListOfAddresses (NSMutableArray ContactAddress (xsdContactAddress objects))<br>
  xsdContactAddress (NSString city)  </p>
  
  <p>I have created Entity as follows<br>
  xsdContact (NSString name, relationship ListOfAddresses too many of type or destination xsdContactAddress)</p>
  
  <p>Here it comes the issues, when i try to add object<br>
  [xsdContactObject addListOfAddressesObject: xsdContactAddressObject];<br>
  it is not adding. it shows _NSFaultingMutableSet when debug.</p>
  
  <p>I understand that since in modal class of  xsdContact ListOfAddresses has  xsdListOfAddresses type, it shows _NSFaultingMutableSet.</p>
  
  <p>Please let me know the solution, one thing i cannot change the definition of modal class.</p>