Rblpapi - using bdp with ISIN / Cusip gives error
<p>I get following error, when I use bdp with ISIN or CUSIP.</p>

<pre><code>bdp ("US25470XAB10 ISIN","ULT_PARENT_TICKER_EXCHANGE")
bdp ("25470XAB1 CUSIP","ULT_PARENT_TICKER_EXCHANGE")

Error in bdp_Impl(con, securities, fields, options, overrides, identity) : 
attempt to set an attribute on NULL
</code></pre>

<p>However, using the Bloomberg ID (below) seems to work.</p>

<pre><code>bdp("EI000902 Corp","ULT_PARENT_TICKER_EXCHANGE")
</code></pre>

<p>Appreciate any workarounds or solutions.</p>