hi Apurva

You could try to make use of the IsRequired property on a block definition.
Or if you'd like to have a more specific validation message, you could try the ValidationState and ValidationText properties. These last two options are also available if you're making use of the Interactive Automation Script Toolkit.

Those options can be used in an interactive automation script in a low code app, but not in Cube. An overview of the supported block types for these options is available here.

Let me know if this works for you.