Expense date validation in IExpense OAF page in r12

Hi All,

Can please any one help me in resolving the issue.

When ever employee raises their expneses mistakenly they some time select future date like they should have slected 01-Oct-2015 instead they select the future date 01-Oct -2016.

Can any one guide me how to put a validation when they select a future date and click on Next button the message should be prompted like cannot use or disable the future date for selction, in order to avoid the rejection at auditor level or at AP invoice importing level.

Thanks,

Durga