This is something we expect to be simple, but it has a lot of secrets. Using parameters in DAX queries is essential, as any other query: The parameter transfers the filtering to the server side instead of the report side and optimize the report performance.
However, DAX queries have many secrets to use parameters. If you don’t handle these secrets, you will get the famous report builder error: The query contains the parameter which is not declared
Report Builder: The parameters’ structure
The parameters structure for SQL queries or DAX queries is very similar, with one difference: In SQL queries,