Need Customization of Fee Module of Ruby on Rails Application Fedena

Hello, Note: Before Bidding, Plz read details and check the demo then bid if u can do the job. I need a very little change in the Fee Collection and Defaulters List of Fedena School Management System a Ruby on Rails Application. The person who know Ruby on Rails and Fedena too can contact me through Chat and I will let him know about the change. Its a very little change for the moment and may be in future I need some more. For now only the Fee module need to be customize a very little. At the moment Fedena has a Collection Due Date for a Category and not for each of the Particulars. I want a due date for each Particular of a Fee Category. And a one little other change will after this one done.