Parameters allow you to filter the data in your report before it is run. For instance, you create a commission report, and the user wants the following filters:
There is a two step process. You first create a parameter, then attach that parameter to a filter.
Creating a parameter alone is NOT enough to make it appear when the report runs, so that the user can filter the data accordingly (example).
After you have created the parameter, you must attach it to a filter.
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