Sum All Values in an If Statement

Hi, 

I created an if statment to use as a measure in a table, the column is 'Proj Sales Total' (See Full Table).

However, when the sum at the bottom is only totaling the 1st two rows (where the statement is true). 

The measure for this field is: 

Proj Sales Total = If( [WrittenSales] > 0, [WrittenSales] * .9, [ForecastCalculation])

Here are the measures being used in the above calculation:

WrittenSales = Sum('Table1'[Sales])

ForecastCalculation = sum('Table2'[Forecast])

How do I get the total to sum all the rows?

If I make thismeasure a calculated column, I get the same incorrect result.