Measure for Accounts Receivable Aging

the measure needs to relate to a filter context coming from visualization/slicer. Assuming the month on the bar chart will be based on Cust_ Ledger Entry'[Due Date] I would try the following:

0-30 Days = 
VAR LastDay= MAX( Cust_ Ledger Entry'[Due Date]) //should return last date in selected period
RETURN
SUMX(
    FILTER(
        'Cust_ Ledger Entry', 
        'Cust_ Ledger Entry'[Due Date]<=LastDay && 'Cust_ Ledger Entry'[Due Date]>LastDay-30
    ),
    'Cust_ Ledger Entry'[Receivable Remaining Amount($)]
)