title: How to fix Core-Data old version(xcdatamodel)'s warning?
body: <p>I knew that modifying core-data previous version breaks the light-weight migration. 
  But I have inverse relationship warnings on old versions of data model. </p>
  
  <ol>
  <li><p>I tried removing old versions that are used before launching first version of our app. I followed this <a href="https://stackoverflow.com/questions/7708392/how-to-delete-an-old-unused-data-model-version-in-xcode-4">SO question, "How to delete an old/unused Data Model Version in xCode 4"</a></p>
  
  <ul>
  <li>It removes warning(Of course it should)</li>
  <li>But I cannot run our app anymore</li>
  </ul>
  
  <p><strong>I think I should keep every versions even though it is not related to light-weight migration</strong></p></li>
  <li><p>I saw this <a href="https://stackoverflow.com/questions/8221813/how-to-disable-no-inverse-relationship-warning-for-coredata-in-xcode-4-2">SO question, "How to disable no inverse relationship warning for CoreData in Xcode 4.2?"</a>. And I tried setting the MOMC_NO_INVERSE_RELATIONSHIP_WARNINGS to YES. </p>
  
  <ul>
  <li>It doesn't removes warning</li>
  <li>And I don't want my future mistake, missing inverse setting, also be ignored.</li>
  </ul>
  
  <p><strong>I think this option is not for my case</strong></p></li>
  </ol>
  
  <p>I don't want to see compiler warning for old version of data model(.xcdatamodel).
  Because these models are not used so that warnings are not significant.</p>
  
  <p>But I want to see future inverse relationship warning on newer version of data model. </p>
  
  <p>What option can I take?</p>