Warning style validation

I have a requirement to add a warning message similar to an error on a
validation. The difference being that this will allow the user to
complete the action but just display a warning message saying “You need
to check this now…”.

The application s a loan calcualtor allowing the user to change certain
settings to aid different calclations. Some custom validations i have
already are below. How would i go about displaying one of them as a
warning message, allowing the user to complete the action but dispaying
a message? Any advice appreciated.

def validate

#Value in custom range

#Years and Months must not equal 0

#Interest Rate set for principal



John B