Changing value of field on Change Request screen dynamically based on another and when Submit pressed

Hi All,

I have added 2 fields Status and Reason to Change Request screen in MDG-S using reuse option.

My requirement is whenever user selects Status as 'Closed', Reason should be blank.

Also once the user clicks Submit, if Status is not equal to 'Closed', I need to automatically change it to 'Closed' and again Reason should be blank.

Can someone please guide me how I can achieve the above. Any help would be highly appreciated.

Thanks and Regards,

Vanessa