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In spite of the warning it appears that the program is calculating the right wind pressure coefficients. Output results AFN Zone Infiltration Mass kg and AFN Node Wind Pressure Pa show different values when the AirflowNetwork:SimulatonControl input parameters Azimuth Angle of Long Axis of Building and Ratio of Building Width Along Short Axis to Wind Along Long Axis are changed. I am still waiting to hear from the help desk and other experts though, for now this seems to be working. EIO output file also shows the actual CP values generated for a set of these two specific input parameters.