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SewerGEMS - The total area in the CN/Area Collection does not equal the total catchment area.

I recently received a model that has been calibrated and run before.  When I try to run the model I receive user notifications for many of the catchments, as follows:  "the total area in the CN/Area collection does not equal the total catchment area."  

The runoff properties for the catchment are set up as follows:  Runoff Method = Unit Hydrograph, Area Defined By = Multiple Subareas, Loss Method = SCS CN, Unit Hydrograph Method = SCS Unit Hydrograph, SCS Unit Hydrograph Method = Default Curvilinear

It appears to only occur when the catchment geometry is set to Use Scaled Area = true and Areas Defined By = Multiple Subareas.  I can correct the issue if I set Use Scaled Area = false and set the Areas Defined By t = single.  But i have to recalculate what the area should be based on the multiple areas/CN numbers.  This will be very time consuming.  

I am currently using SewerGEMS V8i (SELECTseries 5).  I believe the model was originally set up and run in an earlier version of SewerGEMS.  Does anyone have any experience with this issue and if so, any ideas on how to fix it? 

Thank you in advance for any help you can provide!

-Vicki