the link to the file itself could be made with an attribute_view_gui of the file attribute of the related object. In your case probably would be $node.data_map.report_pdf.content.data_map.file. You can modify the aspect of the link with an override of ezbinary.tpl datatype view.
hope this helps!
--
Xavier Serna
eZ Publish Certified Developer
Departament de Software
Microblau S.L. - http://www.microblau.net
+34 937 466 205
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