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Dynamic Format Strings when using Calculation Groups

Alberto Ferrari shows off how you can dynamically generate format strings when using calculation groups in Power BI:

Each product in Contoso weighs a certain weight. The weight is stored in two columns: the unit of measure and the actual weight, expressed in that unit of measure. Specifically, Contoso uses three units of measure: ounces, pounds, and grams.

Because the units of measure are different, you cannot aggregate the weight over different products. If you author a simple measure that computes the ordered weight of products by using a simpleĀ SUMX, the result is wrong:

Click through to see how you can work through this problem.