Adding Delay in When-Then Rule in OpenRemote

Hi All,

I am trying to add a Delay in a When-Then Rule of an Asset in OpenRemote. But when I add the delay the rule SAVE button gets disabled.
If I click the Delay I do not see any delay configuration. Removing the delay enables the SAVE button.
Can someone help me figure out what I am doing wrong?

My goal is to modify the Asset Attribute after a delay of 30 seconds.