Payment Method Preferences Validation Logic how does it work?

Summary:

In My Client Groups > Payment Method Preferences there is an option Should the above selected payment methods be excluded from the 100% validation logic - how does this logic work with the Payment amount type "Amount", defined in question prior (refer screenshot below)?

Content (please ensure you mask any confidential information):

The two options we have for Payment Amount Types are Percentage and Amount. We can select to offer Both. Amount offers Remaining Pay as an option even if 100% has been selected by the employee previously, and vice versa. Is the validation logic meant to do anything with payment amount type "Amount" or is it designed only to work with Percentage?