Deactivate amount validation for personal payment method

Summary:

Hello.

we are currently trying to deactivate the % amount field and its validation logic, that shows up when you create your 2nd personal payment method.

So far, I have made the amount-type-field and the %-amount-field not required, yet the system still forces me to enter a value in the payment amount section.

Does anyone know, if and how I can turn of the validation logic? We dont need it and its quite annyoing.

If that is not possible: is there a way that I can default a % value, e.g. like 20%? I tried an EL expression like this: #{100} and the system enters 100 in the %alue but it is not able to recognize it as an actual value and still triggers the error message you can see on the screen.