SSAS Tabular Calculation Groups – avoid using SELECTEDMEASURE or ISSELECTEDMEASURE
There is a very serious limitation in the behaviour of calculation groups when using the SELECTEDMEASURE or ISSELECTEDMEASURE functions, and we recommend not using them. Why? If a user creates their own custom calculations within their Power BI report (or composite model) then the value of SELECTEDMEASURE changes, breaking your calculation group logic.