Currently you have to create a Calculated Field using CONCAT if you need to create a Relationship between two tables using Multiple Columns. The Concatination takes up Compute and Performance time. If you cant have your clients connect to the model to have a seemless interaction with all tables then the creation of a Semantic Model is a useless.
The whole point of a model is that all the joins are done for the end user and all they have to do is connect to it from Power BI.
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