Need help aggregating values in a dimension table - using different date relationships

dkernen 

I think I understand what you are trying to get to.  If we use CROSSFILTER in a measure from Case to Organ like this.

dimOrgan SUM =
CALCULATE (
    SUM ( dimOrgan[CCRUNOSObsOTransplanted] ),
    CROSSFILTER ( factCase[Referral_ID], dimOrgan[Referral_ID], BOTH )
)

We can then have USERELATIONSHIP shift the dates like you did in your first measures.

dimOrgan BCR_Date = 
    CALCULATE ( 
        [dimOrgan SUM], 
        USERELATIONSHIP(v_dimDate[DateID],factCase[BCR_DateID]) 
    )

And we end up with something like this.

I have attached my updated version of your file for you to look at.

It is cleaner if you do create the measure.  It is not really temporary since I can see you using it in other places but it could probably be named better.