Checks that a number is less than the given value.
Checks whether the incoming number is less than the value you set here. The check only succeeds when the incoming value is strictly smaller, so a value exactly equal to the one you set does not match. Use this to act only on amounts below a threshold, for example flagging an order when its stock level drops under 100. If you want the threshold itself to count as a match, use Number: Less than or equals instead.