This is what sales@liferay said about reports:
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With regards to user guide or manual for the reports portlet there is no documentation for this portlet. Basically, the bundled reports portlet is a simple portlet that allows you to display reports created from
report definitions that you can upload.
These definitions are created in Jaspersoft or BIRT.
You would need to look at:
http://www.jaspersoft.com
or
http://www.eclipse.org/birt/phoenix/
For documentation on how to create the definitions.
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