Hi Layal,

You can add a button in the form view and associate a method in the same object. Then the method should return something that triggers the report.

Example of printing a webkit report:

   def print_check(self, cr, uid, ids, context=None):
        if not ids:
            return  {}

        return {
            'type': 'ir.actions.report.xml', 
            'report_name':'account.check.print',
            'datas': {
                    'model':'account.voucher',
                    'id': ids and ids[0] or False,
                    'ids': ids and ids or [],
                    'report_type': 'webkit'
                },
            'nodestroy': True
            }

Add the button like this in the xml file of the view,

<button name="print_check"  string="Print check" type="object" icon="gtk-execute"/>

Please note that the return style will vary based on the type of report you want to print. Because we have reports like webkit report, aerro report, rml report and jasper report

Thanks