Filtering Value Fields

I have two visuals - a clustered bar chart and a matrix showing Hours Available to Work by Contractor. Some contractors have 2 PO lines on their contract so I added both PO Lines together and created a Total PO Hours column. The contractor row for PO Line 1 has the total and contractor row for PO Line 2 has 0.

01Sep2018RemainingHours = 'FY19RemainingHoursReport'[Total PO Hours]-152

When I drag the months to the Values field for the visual, I select the Sum option. It is subtracting hours available to work twice - once for each contractor row - once for PO Line 1 and again for PO Line 2.

I need to only subtract it once. Is there a way to filter the fields in the visual so it does not subtract available hours to work twice?