You can solve this by adding IF Then statement and defining value
Calculation: IF ATTR([Type]) = ATTR([Data1].[Type]) THEN 'True' ELSE 'False' END
Please find it in attached workbook as well. If this has helped solved your issue then mark it correct as others can benefit from it.
TF Blend Null - AP.twbx 39.6 KB
Thank you -- that was simple - why didn't I think of that!