Travel and Expenses / Create Expense report / Mileage Details

Hi all,

I have a requirement to do some validations whenever the user enters the license plate number in

ESS Travel and Expenses / Create Expense report / Mileage Details .The system must throw a message if the user enters a wrong license plate number.

How do i know whether this is ABAP WD iview or JWD iview.IS there any BADI or BAPI for the validations.

Where is the information about License plate getting saved.

I have created a custom infotype for my requirement. The license plate must be validated from the data present in this infotype.

Can someone post me some advice on this please.

Thanks,

Anil