title: Correct usage of R-package "Rblpapi" connecting Bloomberg with R
body: <p>I'm using the Rblpapi R-package which provides a direct connection between Bloomberg data and R. Unfortunately I'm unable to get the members of the German CDAX at any time except today.</p>
  
  <p>The following function returns the current CDAX members:</p>
  
  <pre><code>require(RBLpapi)
  
  bds("CDAX Index","INDX_MWEIGHT_HIST")
  </code></pre>
  
  <p>I tried to obtain the CDAX members at earlier dates using </p>
  
  <pre><code>bds("CDAX INDEX","INDX_MWEIGHT_HIST",overrides=c(INDX_DATE="20150831")) 
  </code></pre>
  
  <p>but it does not work. Can anybody help me with that? Thanks in advance!</p>