"Active" property doesn't work when configuring launch in context

Hi, I met a problem when using the launch in context feature in vC Ops. The describe.xml is written as below:

<LaunchConfig active="identifier('ConnectionType') == 'VNXe' or identifier('ConnectionType') == 'VNX' " ... >

          ...

</LaunchConfig>

The expected result is: The launch action can be active only when connection type is "VNXe" or "VNX".  However, it doesn’t work as required.  I tried to set identifier('ConnectionType') as one variable in UrlTemplate, and its value is correct.  So I guess my expression in active property may be wrong , or the active property doesn’t support identifier()  at all.

Any suggestions? Thanks!