The blank value in DAX is a special value requiring particular attention in comparisons. This article explores in details the behavior of the blank value in DAX, highlighting a common error in DAX expressions using SWITCH.
In Power BI Desktop and SSAS 2016 you can rely on bidirectional filtering to
implement many-to-many relationships. Nevertheless, as powerful as bidirectional filtering is, it cannot handle scenarios where it would generate ambiguous paths among your tables.
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