How to do a validation of DFF

Hi Team,

We have got a requirement where in we punch in transporter Invoice from AP for every single / multiple AR Invoices.

Now I have created a DFF in AP where in I have attached the AR Invoice Number in the context value. I wanted to attach the customer name also in the DFF so that it would be easy for checking.

But I need to know if there is validation possible in a DFF where in for a AR Invoice Number can be compared against a customer name

Please let me know your thoughts on the above.

Regards