Incorrect Totals: - Matrix

Hi, 

I have an issue with a measure(s) that I have exhuasted all other resources to solve. 

I am trying to solve for "Monthly Inflation" which is defined as:
( [Last Unit Cost] - [Base Unit Cost] ) * [Average Monthly Usage]

I have included all relevent information below to create a sample model of the data as I cannot share the file. 

The receipt data contains only transactions that occur, but I am attempting to calaculate a value when there is no data. My usual sumx, addcolumns, summarize method is not working as I cannot seem to create a virtual table where all 12 months are included. 

Any help would be greatly apprecaited!

Table1: Receipts

Table2: Base Cost

Table3: Demand

Table4: Date

Measures:

AMU = 
CALCULATE(
    SUM('Demand'[N360 Days Demand]) / 12,
    CROSSFILTER(Receipts[Site_Item_Key], 'Demand'[Site_Item_Key], Both),
    ALL('DateTable')
)

Avg Unit Cost (R) = 
DIVIDE( [Receipt COGS], [Receipt QTY], BLANK() )

Base Cost (R) = 
CALCULATE(
    SELECTEDVALUE( 'Base Cost'[Base Cost] ),
    CROSSFILTER( 'Base Cost'[Site_Item_Key], Receipts[Site_Item_Key], Both )
)
---------------------------------------------------------------------------------------------------------------------------------------
Last Unit Cost (R) = 
VAR LastMonthWithReceipts =
    CALCULATE(
        MAX('DateTable'[Month Year No]),
        FILTER( ALLSELECTED( 'Receipts' ),
        'Receipts'[Eff Date] <= MAX('DateTable'[Date])
        )
    )
VAR ReceiptCost = 
    CALCULATE(
        [Avg Unit Cost (R)],
        FILTER( ALLSELECTED( 'DateTable' ),
        'DateTable'[Month Year No] = LastMonthWithReceipts
    )
    )
RETURN ReceiptCost
---------------------------------------------------------------------------------------------------------------------------------------
Monthly Inflation (R) = 
VAR BaseUnitCost = CALCULATE( [Base Cost (R)], ALL( 'DateTable' ) )
VAR Result = ( [Last Unit Cost (R)] - BaseUnitCost ) * [AMU]
RETURN Result
---------------------------------------------------------------------------------------------------------------------------------------
Receipt COGS = 
SUM( Receipts[Extended Cost] )
---------------------------------------------------------------------------------------------------------------------------------------
Receipt QTY = 
SUM( Receipts[Quantity] )
---------------------------------------------------------------------------------------------------------------------------------------

DateTable = 
ADDCOLUMNS (
   CALENDAR ( DATE(2023,1,1), DATE(2023,12,31) ),
    "Year", YEAR ( [Date] ),
    "Month", FORMAT ( [Date], "MMM" ),
    "Month No", MONTH ( [Date] ),
    "Quarter", "Q" & CEILING ( MONTH ( [Date] ) / 3, 1 ),
    "Week No", WEEKNUM ( [Date] ),
    "Weekday", FORMAT ( [Date], "dddd" ),
    "Weekday No", WEEKDAY ( [Date], 2 ) + 1,
    "Month Year", FORMAT ( [Date], "MMM yyyy" ),
    "Month Year No", YEAR ( [Date] ) * 100 + MONTH ( [Date] ),
    "Week Year", YEAR ( [Date] ) * 100 + WEEKNUM ( [Date] ),
    "Month Sort", YEAR ( [Date] ) * 10000 + MONTH ( [Date] ),
    "Week Sort", YEAR ( [Date] ) * 10000 + WEEKNUM ( [Date] )
)

Model:
Expected Output: