Add Column Summarize Pattern not returning the correct result with calculated dimension

tamerj1  - sorry about the earlier post, I was a bit frazzeled when I wrote it up. Hopefully this is more clear.

I am unable to obtain the correct result from an add columns summarize pattern, when I am filtering on a dimension which does not exist within the fact table. 

I am working with both forecasts and actuals, and I would like to create a version which is called "Forecast + Actuals" which is a combination of actuals and the forecast values which is after the last date of actuals. 

I know you can do this via a measure like if selected value = "Forecast + Actuals" then return calculate measure, but I would prefer to do it in one measure to reduce the complexity of my measure tree.

Here is an example data set. 

Here is the Version Dimension table. "Forecast + Actuals" doesn't exist in my fact table, but can be derived from the fact table through a combination of Forecast and Actuals. 

I would like a measure which would populate the following: 

I was trying to accomplish it like this via this measure: 

DataSum = 

 VAR MaxActualsDate =
    CALCULATE ( MAX ( FactTable[Date], Version = "Actuals" ) )
VAR SummaryData =
    ADDCOLUMNS (
        SUMMARIZE ( 'FactTable', 'Date'[Date], Versions[Version] ),
        // this is the core table
        "@SourceValue", CALCULATE ( SUM ( FactTable[Value] ) )
    )
RETURN
    IF (
        SELECTEDVALUE ( Versions[Version] ) = "Current Forecast + Actuals",
        CALCULATE ( SUMX ( SummaryData, [@SourceValue] ), [Version] = "Actuals" )
            + CALCULATE (
                SUMX ( SummaryData, [@SourceValue] ),
                [Version] = "Forecast",
                Date[Date] > MaxActualsDate
            ),
         SUMX ( SummaryData, [@SourceValue] )
    )

I didn't find any success here - so then I decided to modify the variable table by unioning the "Forecast + Actuals" into the SummaryData variable table. When i look at this in DAX studio, the table does have  "Forecast + Actuals" with values, however, I am unable to bring this into a visual.

DataSum = 

var MaxActualsDate = calculate( max(FactTable[Date],Version="Actuals")

Var SummaryData = ADDCOLUMNS (
    TREATAS (
        UNION (
            SUMMARIZE ( 'FactTable', 'Date'[Date], Versions[Version] ), // this is the core table
            ADDCOLUMNS (
                SUMMARIZE ( FactTable', 'Date'[Date], Versions[Version]  ),
                "Version", "Current Forecast + Actuals" // this is where i'm trying to add the "fake data series"
            )
        ),
        'Date'[Date],
        Versions[Version]
    ),
    "@SourceValue",
        IF (
            [Version] = "Current Forecast + Actuals",
            CALCULATE ( SUM ( FactTable[Value] ), ALL ( Versions ), Versions[Version] = "Actuals" ),
            CALCULATE ( SUM (FactTable[Value])
        )
)

Return Sumx ( SummaryData, [@SourceValue])