Enforce Credit Card Transaction Submission Age Limit Not Working

Hi IExpense and AP Experts,

We have set our Credit Card Transaction Age limit to 1 day in our IExpenses Setup.

However, users are still able to select only 1 of their many AMEX lines, and submit the expense reports successfully.  They do not even have any cash expenses in the expense report.

How can we get this functionality to force them to select all AMEX lines over the 1 day transaction age limit?

What have you done to overcome this? 

Please help and advise.

Thanks so much for any suggestions.

Niketa