Effective Power BI DAX debugging steps for complex formulas:
Utilize Variables: Divide a complex formula into simple parts within scope by using variables (VAR). This helps isolate each of the components and test them in turn, which is the ideal way of tracing the source of the complication in the formula.
Empower yourself with tools like DAX Studio: Use DAX Studio, among other tools, for query performance assessment, query plan exploration, and execution of DAX code to better comprehend formula functions.
Use Intermediate Calculations: Alternatively, instead of actual intermediate steps, apply additional measures or tables so you can see how the result changes in every step. You might be able to point out the reason why the formula yields an unexpected outcome.
Returning a Value: Do not use the RETURN statement unless you have a very good reason for doing so; otherwise, it becomes impossible to view the intermediate result of the computed expressions in a complex evaluation and gives an idea of how each portion functions.
Test in All Possible Active Filters: To validate that your formula works correctly in different situations, make sure that you check it out in several different filter or slicer combinations until you are confident that it works as required.
Use the Power BI Formula Bar: Do not ignore the error messages provided in the formula bar, as they will usually guide you in correcting any syntax or logical errors.
Divide and conquer, test components individually, and use DAX tools external to Power BI to resolve some of the intricate DAX formulas.
