Need knowledge on drop down cascadinghttps://community.appian.com/discussions/f/general/20723/need-knowledge-on-drop-down-cascadingHi , I have two Drop downs. I want to Select another Drop down value based on selection in different drop down. First DD will have choice label:(&quot;dev&quot;,&quot;engg&quot;,&quot;it&quot;) and choice value:(1,2,3) Second DD choice Label: (&quot;DevEnv&quot;,&quot;TestEnv&quot;,&quot;ProdEnv&quot;,&quot;Dev2en-USTelligent Community 12RE: Need knowledge on drop down cascadinghttps://community.appian.com/thread/80754?ContentTypeID=1Tue, 06 Apr 2021 13:28:59 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:9ea5a579-b59f-4213-82d3-3c3d46037950rameshk401070<p>Have the DD placeholder set to some text (Example: &quot;--Select--&quot;)</p><div style="clear:both;"></div>RE: Need knowledge on drop down cascadinghttps://community.appian.com/thread/80752?ContentTypeID=1Tue, 06 Apr 2021 09:28:02 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:8341cb66-7ee6-4298-b834-182653a528ecfaisalf0003<p>When I am running this whole code under this doc the error I am getting.Could you please help:</p> <p></p> <p>Error:<strong class="StrongText---richtext_strong StrongText---inMessageLayout StrongText---error">Could not display interface. Please check definition and inputs.</strong><span> </span><span>Interface Definition: Expression evaluation error at function a!dropdownField [line 23]: A dropdown component [label=&ldquo;Department&rdquo;] has an invalid value for &ldquo;value&rdquo;. Value cannot be null if placeholder is also null.</span></p><div style="clear:both;"></div>RE: Need knowledge on drop down cascadinghttps://community.appian.com/thread/80749?ContentTypeID=1Tue, 06 Apr 2021 08:08:06 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:e0801bf4-8502-4886-a426-b6a0a4610495akshayg0006<p>Hope this helps out:&nbsp;</p> <p><a href="https://docs.appian.com/suite/help/18.4/recipe_configure_cascading_dropdowns.html">docs.appian.com/.../recipe_configure_cascading_dropdowns.html</a></p><div style="clear:both;"></div>