Hello,<div><br></div><div>I try to put a condition in my LHS, such as:</div><div><br></div><div><div>rule &quot;initial_playground_dialog&quot;</div><div>    #agenda-group &quot;firstTimeUser&quot;</div><div>    #salience 99</div>
<div>    when</div><div>        $gst : GameStateController(!hasEventOccurred(&quot;initial_playground_dialog&quot;))</div><div>        $list : List()</div><div>        $screen : FrontendScreen.PLAYGROUND</div><div>    then</div>
</div><div>       ....</div><div>end</div><div><br></div><div>where &#39;FrontendScreen&#39; is an enum and PLAYGROUND is its property. However I get a syntax error. What&#39;s the proper way to check for and assign such a session object?</div>
<div><br></div><div>Any help is appreciated!</div><div><br></div><div>Best regards,</div><div>Martin</div>