title: XBBG works for historical, but not intraday, data with regards to government bonds
body: <p>I'm using the <code>xbbg</code> library to download bloomberg data and all is well so long as I stick to equities and/or end of day data. But if I try to get intraday data for a government bond, it fails to find the exchange.</p>
  <pre><code>blp.bdib(ticker='US912810SM18 Corp', dt='2020-10-17').tail()
  </code></pre>
  <p>will produce the following:</p>
  <p><code>KeyError: 'Cannot find exchange info for US912810SM18 Corp'</code></p>
  <p>However, if I use <code>blp.bdh</code> for end of day date it finds it without a glitch.</p>
  <p>How should I modify the assets.yml and exch.yml files to make it work?</p>