Short Answer: That message appears because no dataset is attached to the report; you must click '+ Add data' under Data used first.
PreRequisites
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Access to the Report config screen.
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A dataset to attach reconciliation data, another report's output, or file.
Steps
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Check the Data used section at the top of the Data tab.
You see the '+ Add data' button if no dataset is attached. -
Click '+ Add data' and attach the dataset you want to use.
Rows/Columns/Values sections become active and the 'Add data before...' messages disappear.
Troubleshooting
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I clicked '+ Add data' but the message remains.
LikelyCause: Dataset attachment failed, upload incomplete, or wrong dataset was selected.
Action: Confirm the upload/attachment finished, refresh the page, or re-run '+ Add data' to select the correct dataset. -
I can't attach a dataset.
LikelyCause: Permission restrictions or UI error in your browser.
Action: Try another browser, clear cache, or contact your admin to confirm you have the right permissions.
Note: The Rows/Columns/Values areas are intentionally inactive until a dataset is added via '+ Add data'.