hotspot on more than one fields in ALV Report

I want to add Hotspot on more than one field in ALV,

one field is Vbeln , one is BSTNK, one is matnr and so on.

i have used form user_command.and have written coding for Vbeln (on vbeln i am showing transaction VA02)

i want to pass an eror mesaage when user clicks on bstnk or matnr.

Thanks