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For the `validateLine` client script event. Is there a way to know if the user is adding or editing a particular line?

No. Why do you need to have that distinction?

validate line fires on both edit and add and I need to do different things on each event

I'm not near NS at the moment, but check `line` and see if it's set for a new line

Easiest thing to do to spot differences is just test &amp; `console.log` the lines in your clientscript to see if there's anything that is different between the two situations

Ok, my question though is why do you need to do things differently between the two events? This sounds like something that needs to be resolved at the design stage.