You are designing a Power BI model with a FactSales table containing millions of rows and a DimProduct table containing 50 000 rows. The current relationship between FactSales[ProductKey] and DimProduct[ProductKey] is set to Many-to-Many with bi-directional filtering. Report users say that slicers by product category do not properly restrict FactSales values. You need to fix the model while avoiding unnecessary bi-directional filters or ambiguous paths. What should you do?
Change the relationship to Many-to-One and set the filter direction to Both.
Delete the existing relationship and recreate it using a bidirectional bridge table to connect the two tables.
Change the relationship to Many-to-One and keep the filter direction set to single (DimProduct filters FactSales).
Keep the Many-to-Many cardinality but change the filter direction to single.
In a star schema the dimension table (DimProduct) should be on the "one" side and the fact table (FactSales) on the "many" side. A Many-to-Many, bi-directional relationship violates that pattern, can hide data-quality issues, and introduces extra filter paths that hurt performance. Converting the relationship to Many-to-One and keeping single-direction filtering (DimProduct → FactSales) lets product category selections flow to the fact table without the overhead or ambiguity of bi-directional filtering. The other options either retain the wrong cardinality or enable unnecessary bi-directional propagation.
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