title: Using price source option (PCS) in the BDH formula in R
body: <p>I have a time series that had its price source changed (from BSCO to BSCN) and I need an entire history of it (it can come in two separate time series it does not matter). I have been trying to compile formulas to get the date but they do not work.</p>
  
  <pre><code>BDH("CMSERSBL Index","px_last","24/11/2004","24/11/2015", option_names = "PCS", option_values = "BSCO")
  
  BDH("CMSERSBL Index","px_last","24/11/2004","24/11/2015", option_names = "PCS", option_values = "BSCN")
  </code></pre>
  
  <p>Any ideas how to correct the formulas?</p>