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   I confirm purchase order which has invoicing control method "Based on Purchase Order Lines".
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  !workflow {model: purchase.order, action: purchase_confirm, ref: purchase_order_6}
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  In order to test create invoice for purchase order line.
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  !python {model: purchase.order}: |
    invoice_line_obj = self.pool.get('purchase.order.line_invoice')
    purchase_order = self.browse(cr, uid, ref("purchase_order_6"))
    context.update({'active_model': 'purchase.order', 'active_ids': [ref("purchase_order_6")]})
    for purchase_line in purchase_order.order_line:
        invoice_line_obj.makeInvoices(cr, uid, purchase_line.id, context=context)
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  I check the invoice of order.
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   !python {model: purchase.order}: |
     purchase_order = self.browse(cr, uid, ref("purchase_order_6"))
     for purchase_line in purchase_order.order_line:
       assert len(purchase_order.invoice_ids) == 1, "Invoice should be generated."
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  I set the default invoicing control method "Based on Purchase Order Lines".
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  !python {model: purchase.config.settings}: |
    new_id = self.create(cr, uid, {'default_invoice_method': 'manual'})
    self.execute(cr, uid, [new_id])