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  In order to test the PDF reports defined on a Purchase Order, I print a Request Quotation report
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  !python {model: purchase.order}: |
    import os
    import openerp.report
    from openerp import tools
    data, format = openerp.report.render_report(cr, uid, [ref('purchase.purchase_order_1'), ref('purchase.purchase_order_2')], 'purchase.quotation', {}, {})
    if tools.config['test_report_directory']:
        file(os.path.join(tools.config['test_report_directory'], 'purchase-request_quotation'+format), 'wb+').write(data)
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  I print Purchase Order report
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  !python {model: purchase.order}: |
    import os
    from openerp import tools
    from openerp.report import render_report
    ids = [ref('purchase.purchase_order_1'), ref('purchase.purchase_order_2')]
    data, format = render_report(cr, uid, ids, 'purchase.order', {})
    if tools.config['test_report_directory']:
        file(os.path.join(tools.config['test_report_directory'], 'purchase-purchase_order_report'+format), 'wb+').write(data)