How to validate empty list lookup field in Nintex Form? I want to hide it if empty during cascading.

Hi Richter Belmont‌,

Did you get the answer. Else try this.

Select Lookup Control and Create a new rule like below.

Replace 'DetailMilestone' with your named control. And you want to check for a particular value then you have give like DetailMilestone == "1;#Hold" ('1' is a lookup item id in the lookup list and 'Hold' is the lookup value in the lookup list) because it is a lookup value.

Thanks,

Lakshmi Narayana C‌