I have two dax code below working perfectly,

Current Week Amt = 
VAR CurrentFiscalWeek = MAX( 'DF'[Fiscal Week num] )
RETURN
CALCULATE(
     [Measure],
    'DF'[Fiscal Week num] = CurrentFiscalWeek
)

Current Week Amt_2 = 
SUMX(
    SUMMARIZE('DF', 'DF'[Source], 
              "fixed" ,[Current Week Amt]),
              
              [fixed])

yet the first one is not giving the right totals. Because Fiscal Week num differs. I change the Current Week Amt_2 for each table that I have. but i was wondering if there is a way to leverage VAR CurrentFiscalWeek = MAX( 'Inventory'[Fiscal Week num] ) so the table total may come correctly ? many thanks in advance.

 Source    Fiscal Week num
    Company A       52
    Company B       49
    Company C       48