To troubleshoot cascading parameters in Power BI Paginated Reports, follow these steps.
Parameter Dependencies Must Be Checked
Ensure that each cascading parameter is properly dependent on the preceding parameter. In Report Builder, the Available Values section should be checked for each parameter to ensure that the dataset supplying the values correctly refers to its preceding parameter.
Check Dataset Queries
Go through the queries for the parameter datasets. Each parameter should filter the dataset correctly with SQL expressions like WHERE Column = @ParameterName. Confirming that the parameters are in the expected order is important if the stored procedures are to be used.
Test Parameters in Isolation
Execute the individual parameter dataset query within SQL Server Management Studio or any other query tool. Verify the returned results with some sample inputs consistent with the parameter values.
Check the Parameter Data Types
Check the data types of parameters and ensure they are consistent with the dataset's column data types. Inconsistencies of data types, such as integer versus string, may break your parameters.
Employ Some Debugging Methods
Display the parameter value in a textbox on the report to validate what values were passed.
Tracing- Enable tracing in the SQL server to see what actual queries were fired.
Use default parameter values to test if they behave as expected.
Validate the Report Execution Order
If one parameter references another that has not yet been populated, cascading might break. Ensure that the report's parameter order is set so that dependent parameters get updated dynamically.
Check for NULL or Blank Values
If the previous parameter selection returns NULL or blank values, make sure that the dataset handling the dependent parameters has enough logic to handle those cases, such as using ISNULL() in SQL or conditional logic in DAX.
