Do you have more information on this diag? Is it "The total number of days entered for calculating the housing expense limitation exceeds the total number of days in the qualifying period that fall within the current year."? 

I found some information possibly related. Make sure the travel dates are accurate, also take a look at the qualifying days under Housing expense limitation. Expand the location field to find the column to ensure the qualifying days is accurate. 

Hope this helps, if not feel free to contact ProConnect.