After creating a new Flexible Birt report, before visualising it you need to add the data set fields with the Birt Report Designer and publish the report.
So the "Send" button of the "Preview" form on the "Edit report" page should be grayed/unavailable before the report has been plublished. If it's then not correclty done that's an user problem.
This should also be clearly documented, hence related with OFBIZ-9188
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