How to do it...

To implement this recipe, do the following:

1. Create the following measure:

Days Sales Outstanding (Month) = 
    VAR __Year = MAX('R09_Table'[Year])
    VAR __Month = MAX('R09_Table'[Month])
    VAR __BeginDate = DATE(__Year , __Month , 1)
    VAR __EndDate = EOMONTH(__BeginDate, 0)
    VAR __Days = DATEDIFF(__BeginDate, __EndDate, DAY) + 1
    VAR __AR = 
        SUMX(
            FILTER(
                'R09_Table',
                'R09_Table'[Category] = "Accounts Receivable"
            ),
            'R09_Table'[Value]
        )
    VAR __Credit = 
        SUMX(
            FILTER(
                'R09_Table',
                'R09_Table'[Category] = "Net Credit Sales"
            ),
            'R09_Table'[Value]
        )
RETURN
    DIVIDE(__AR, __Credit, 0) * __Days

2. On a Report page, create a Matrix visualization and add the Month column from the R09_Table table to the Rows area of the visualization, as well as the Days Sales Outstanding (Month) measure, to the Values area of the visualization.