Combine 2 tables based on a relationship

[DouweMeer]

So I got a header info table and a line info table. The problem is the header info table contains sometimes multiple customers for the same contract. Each of this customer has its own record. Now I want 1 big table where these are all combined. For each contract line my intention there will be the same amount of records as there are customers. 

In theory this would end up as a per record a generate ( contract line , customers ).

To show a bit, below a little example. In green there is the contract line table. In red there is the header table. The result is supposed to be the blue one. 

For now I just thought of creating a generate on distinct customers vs the order lines. This would result in the orange square. Then I just add a dax expression, in purple, to verify whether one of the record is correct. 

Now my question, is there an easier way to do this than what I have in mind in the orange part to get the blue box? 

[HotChilli · Accepted solution]

Merge the tables in Power Query.

Inner Join on Contract

[DouweMeer]

@HotChilli 

Would it be possible to create a relationship for naturalinnerjoin to use between 2 VAR's? Userelationship won't allows me to use a table reference in combination with calculatetable. 

[DouweMeer]

Thank you for the suggestion. I will check it next week (my office time for this week has ran out).