contract/analytic_hours_block/report.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>

        <report id="block_hours_report"
               string="Block Hours State"
               model="account.hours.block"
               name="account.hours.block"
               rml="analytic_hours_block/report/hours_block.rml"/>

    </data>
</openerp>