title: "operator does not exist character varying = bigint" in GnuHealth project
body: <p>We are  developing the module in tryton based on <a href="http://health.gnu.org/" rel="nofollow">GNU Health</a>.We got the following error :</p>
  
  <pre><code>ProgrammingError: operator does not exist character varying = bigint
  Hint: No opreator matches the given name and argument type(s). You might need to add explicit type casts 
  </code></pre>