Revert the fix and add it to your backlog. You've got enough to worry about when porting/rewriting, don't add additional dimensions of complexity and risk by t

Revert the fix and add it to your backlog. You've got enough to worry about when porting/rewriting, don't add additional dimensions of complexity and risk by trying to change business logic at the same time. Minimize risk by minimizing change...then when the new system is up on its feet, go back and fix all the mistakes you found.