PBI Not Applying Relationship between Imported Table and Calculated Table

I have a dimension table called Plant, it has a unique column PlantId. This table relates to 3 other imported fact tables just fine with one-to-many relationship. 

I created a calculated table in DAX that creates a set of KPI Score Streaks (i.e this KPI has been increasing/decreasing 'x' number of months in a row). I added a relationship in the model editor and it detects a correct one-to-many, but when applying, the relationship is not created. It will however, allow me to create a many-to-many which it is not. PBI will NOT allow me to change the many-to-many, to a one-to-many relationship. In the relationship editor, I try to switch to one-to-many and it does nothing, no changes are applied.

I also tried other dimensional tables like Date. Same outcome. 

I am stumped as to why it won't allow this relationship to be created.

I event tried TMDL to adjust the relationship and that just gives me a useless error. 

Any assistance is greatly appreciated.