Relationship between two columns in different tables

Hello, 

So I'm trying to make a relationship between two tables to make it understand that the two parameters are  the same parameter. 

However as you see in this table visual it still is not letting the dependent value of the parameter "Flow 1" belong to the same parameter different table "Flow 2" hence total head doesn't correspond to any value in "Flow 1". Please note that total head is same as head curve but one is imported and one is calculated, respectively. 

the question here is how can I make this relationship possible.