documentId in which the flow whose id is
 given by the return from <a href="#getFromOutcome()"><code>getFromOutcome()</code></a> is defined. Implementations must override this method to return
 the value defined in the corresponding application configuration resources element. The base implementation returns
 the empty string.
 </p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the toFlow documentId.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.2</dd>
</dl>
</li>
</ul>
