Is it possible in user exit to display 10 fileds in a popup

Hi SDN members,

I had typical req to develop a user exit where i need to give a popup containing 10 fileds on it.

can any one tell how it's possible to display a popup with 10 fileds in USER EXIT.

user wants to display a popup when a duplicate invoice comes when he is creationg a invoice in MIRO or FV60

please let me know.

Thanks & regards

Naresh