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SSAS tabular model and bridge tables

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I have a healthcare model, where an episode has 1 to many diagnosis. I have used the Kimball bridge table to model the data (http://www.kimballgroup.com/2012/02/design-tip-142-building-bridges/). I have created a SSAS tabular model and created relationships between the episodes table the bridging tables (see attached). When I analyse the data in excel, and filter on diagnosis from the diagnosis table, it does not correctly filter the episode measures. (see attached). From what I've read, it seems the filter context is not passed through the relationship. Does anyone know how to get his working? I just want to be able to filter a list of episodes based on their diagnosis.

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