Timequest and external intefaces

Not sure. I never use report_path(since it isn't a constraint, just a probing tool of how long is this path). (although your first sentence says report_timing, which I would not expect to work, since it's not on the datapath) If you run:

report_timing -setup -from [get_ports tvp_yout*] -panel_name "s: tvp_yout Inputs"

what happens? That's the type of report I would run. (And if tvp_yout were an output bus, I would change the -from to -to)