Ignore relationship with date table while still referencing date table in measure

Bit of a weird problem that I haven't come across before that I just can;t figure out how to get around. I'm using a data model (not mine) where the Date table has a relationship with the Asset Status table on the EffectiveFromDate (in Asset Status table - see below for example of data). For this measure I'm trying to create, I want to ignore that relathionship becuase I need to include the rows in the Asset Status table where the EffectiveFromDate is not in the filtered date range. HOWEVER, I do need to reference the filtered Date table as part of the expression in my SUMX calculation. Here is the measure before I try to ignore the active relationship...it calculates fine:

 

DaysVoidinPeriod =

SUMX (

    'AssetStatus',

    VAR EffectiveFrom = 'AssetStatus'[EffectiveFromDate]

    VAR EffectiveTo =

        IF (

            ISBLANK ( 'AssetStatus'[EffectiveToDate] ),

            MAX ( Date_DIM[FullDate] ),

            'AssetStatus'[EffectiveToDate]

        )

    VAR StartDate =

        MAX ( EffectiveFrom, MIN ( Date_DIM[FullDate] ) )

    VAR EndDate =

        MIN ( EffectiveTo, MAX ( Date_DIM[FullDate] ) )

    RETURN

        IF (

            StartDate <= MAX ( Date_DIM[FullDate] ),

            DATEDIFF ( StartDate, EndDate, DAY ),

            BLANK ()

        )

)

 

Problem is, however I try to apply ALL or REMOVEFILTERS to the SUMX function, it is messing up the MAX and MIN functions that refer to the date table. Below is an example of the data in the Asset Status table. Essentially what I want the measure to be able to do is to apply the SUMX measure above, but across all rows in the Asset Status table, so it isn't filtering out rows where the EffectiveFrom date is outside the filtered range (which is what is happening currently).

 

Any help would be much appreciated!