Greetings !
I am on Dynamics 365 v9.0, I have a business process flow with multiple paths and stages and each stage ends up to Opportunity Close stage.
Upon reaching Opportunity Close stage, I want my users to select "Reason Code" (mandatory) before clicking on the Finish button, based on the reason code selected the Opportunity will close as Won or Lost.

Issue is, even though Reason Code is a Mandatory field in the business process flow, the user is able to click "Finish" button without having to select Reason Code.
Is there a way to enforce user to select this field before hitting the Finish button?
Thanks,
Shyam