Clicks and conversions that were created as tests cannot be deleted.

Further, only revenue generated by approved conversions is counted towards your generated revenue, if you have some test conversions, you can change their status to e.g. "Test" and everything will be separated.
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Each individual conversion can be changed to "Test" status so it doesn’t count towards your revenue limit.

If you also settled a test conversion, you can delete the settlement and then you will be able to change status of a conversion.

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Changing all test conversions to status e.g. "Test" will allow reports to separate from these test data.