Reporting IO latency during PostCTS stage

Hello All, I am a new user for INNOVUS. while doing the PNR flow, I was trying to update io_latency at postCTS stage. I use the commands to reset propagated clocks first and later update_io_latency followed by timeDesign to report timing. Whenever I do this, the io_latency is NOT updated in my report. Can you someone help me to understand the steps I should check before I do update_io_latency Thank you Sasi