title: Error 3031 mapping fragments starting at line 439:Non-nullable column
body: <pre><code>Error 3031: Problem in mapping fragments starting at line 439:Non-nullable column D_LINK.CARTON_QTY in table D_LINK is mapped to a nullable entity property.
  </code></pre>
  
  <p>I have a view <code>D_LINK</code> with a column </p>
  
  <pre><code>CARTON_QTY(int, not null)
  </code></pre>
  
  <p>I dont understand where is my problem
  do i have to make it null \ how? </p>