Imported POA hourly data with multiple orintations

[SE2015]

Hi, I have an existing multi orientation system that am trying to simulate in PVsyst.  The pyranometer is installed parallel with the modules on one of the orientations.  When I import the POA hourly data, PVsyst warns me that the data is only applicable to the modules belonging to that orientation.  Will the simulation of the entire system be correct, or do multiple orientation systems require multiple pyranometers, if they are tilted?

Thank you