Working of Approval Attribute 'Payment terms modified'

Summary:

Hi Everyone,

How does the attribute 'Payment terms modified' functions in the Approval rules?

Our understanding as per the below document is: It checks if the payment terms are modified in the change order.

We setup the rule with a condition that 'Payment Terms modified' : 'Is not blank'

Our expectation: If the Payment Terms are modified and not changed to 'Blank', then this rule should be triggered.

Actual observation: The rule is getting triggered even if we are not making any changes to the Payment Term.

Want to understand if we are missing something on how this attribute will work.