DAX Total is not working

Hi Aazam 
Please try

item cost for max date =
SUMX (
    SUMMARIZE (
        'Lookup Table',
        'Lookup Table'[Item Code],
        'Lookup Table'[Item Category],
        'Lookup Table'[SKu],
        'Lookup Table'[Location Name]
    ),
    VAR MaxDate =
        CALCULATE (
            MAX ( 'Lookup Table'[transaction_date] ),
            ALL ( 'Lookup Table'[transaction_date] )
        )
    RETURN
        CALCULATE (
            SUMX ( 'Lookup Table', 'Lookup Table'[Item Cost] ),
            KEEPFILTERS ( 'Lookup Table'[transaction_date] = MaxDate )
        )
)

I resolved it by myself

SUMX (
    SUMMARIZE (
        'Lookup Table',
        'INV Sku'[sku],
        'INV Categories'[name],
        'INV Items'[item_code],
        'INV Locations'[location_name]
    ),
    VAR item_cost_for_max_date =
        CALCULATE (
           [item cost for max date]
        )
    VAR item_on_hand =
    CALCULATE(
        [Item_On_Hand_SUM]
    )
    RETURN
       
            item_cost_for_max_date * item_on_hand
       
)