Issue with subtotals after multiplication factor

Hi awolf88 
Of course your data model more complex than the sample file. It is not easy to identify the problem without deeply looking into the data. Therefore, the answer to your question is "it depends". It depends on many factors. But I may guess that the month column (Either Month Name or Year Month, whichever you are using) must be involved in table over which SUMX performs its iteration. I believe the following formula would solve the issue

m Orders total *factor NEW 3 = 
SUMX (
    CROSSJOIN ( VALUES ( Budget[Customer/Prod] ), VALUES ('Date'[Month Name] ) ),
    CALCULATE ( 
        CALCULATE ( 
            SUM ( Sales[Ordered Qty] ),
            TREATAS (
                VALUES ( Budget[Customer/Prod] ), Sales[Customer/Prod]
            )
        ) * SUM ( Budget[mult. Factor] )
    )
)