Try this solution :first of all you must add an xml file under a report folder, do not forget to add the path under openerp.py

in your xml.file:

<?xml version="1.0" encoding="utf-8"?>

<openerp>

<data>

<report string="Dossier Medical"

id="action_report_dossier_medical"

model="medical.appointment"

report_type="qweb-pdf"

name="medical.report_dossier_medical"

file="medical.report_dossier_medical"/>

<template id="report_dossier_medical">

.......................................

.....................................

</template>

</data>

</openerp>

good luck