title: Two entities with possibly different keys are mapped to the same row
body: <p>I have Table 
  <code>Field1 PK int not null 
   Field2 PK int not null</code> like this 
  when i want to map this table I get this error</p>
  
  <pre><code>Error   3   Error 3034: Problem in mapping fragments starting at lines 2212, 2218:
  Two entities with possibly different keys are mapped to the same row.
  Ensure these two mapping fragments map both ends of the AssociationSet to the corresponding columns.
  </code></pre>
  
  <p>And I tried to delete and re-create that table inside model. When i add table it gives another error but at the end i always get this error</p>
  
  <p>How can i handle this problem please help me...</p>