As always, many thanks Yasser, nyes p_sum=0.0 was defined.nAnd yes, I knew about the Get_report_definition_values, however, the idea was to simply read/tally/ from surface-integrals instead, becuase choosing 4 surfaces, lets say, for a report definition gives a cumulative pressure at all the 4 surfaces, while doing the same on surface integral gives individual values at each surface.nThis means, there should be 4 such reports for 4 different surfaces, and this will quickly become cumbersome, if there are many surfaces, (inlet/outlets of tubes of heat exchangers).n