FPM Button Validations in Custom View

Dear All,

In one of my dev.. used FITE_VC_GENERAL_DATA Component for travel. We enhance this by adding one view and it has

table. IF table is initial( no values ) and user click on REVIEW button( FPM ) i have to raise a message. Where i have to write the code to validate this... Please any help.

Thanks,

venkat.