JDE Expense Module - limits on expense categories

I would welcome any experience from JDE users of the Expense Management system who would have had to put controls in place for travelling expenses where there are differing travel rates applicable depending on the number of kilometres/ miles travelled within a calendar year by an employee.

In our case there will be 3 different band limits.

While we can set up the 3 separate expense categories, it will still be a manual choice on the part of the employee to select the appropriate expense category for that band which will be liable to error.

There is an enhancement request on this functionality - but have users any experience/suggestions for adding controls in this type of situation?