diff --git a/tests/scenario_sale_invoice_grouping_multiple.rst b/tests/scenario_sale_invoice_grouping_multiple.rst
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+=======================================
+Sale Invoice Grouping Multiple Scenario
+=======================================
+
+Imports::
+
+    >>> from decimal import Decimal
+
+    >>> from proteus import Model, Wizard
+    >>> from trytond.tests.tools import activate_modules
+    >>> from trytond.modules.company.tests.tools import (
+    ...     create_company, get_company)
+    >>> from trytond.modules.account.tests.tools import (
+    ...     create_fiscalyear, create_chart, get_accounts)
+    >>> from trytond.modules.account_invoice.tests.tools import (
+    ...     set_fiscalyear_invoice_sequences)
+
+Activate modules::
+
+    >>> config = activate_modules('sale_invoice_grouping')
+
+    >>> Party = Model.get('party.party')
+    >>> ProductCategory = Model.get('product.category')
+    >>> ProductUom = Model.get('product.uom')
+    >>> ProductTemplate = Model.get('product.template')
+    >>> Sale = Model.get('sale.sale')
+    >>> Invoice = Model.get('account.invoice')
+
+Create company::
+
+    >>> _ = create_company()
+    >>> company = get_company()
+
+Create fiscal year::
+
+    >>> fiscalyear = set_fiscalyear_invoice_sequences(
+    ...     create_fiscalyear(company))
+    >>> fiscalyear.click('create_period')
+
+Create chart of accounts::
+
+    >>> _ = create_chart(company)
+    >>> accounts = get_accounts(company)
+
+Create parties::
+
+    >>> customer = Party(
+    ...     name="Customer",
+    ...     sale_invoice_grouping_method='standard')
+    >>> customer.save()
+
+Create account category::
+
+    >>> account_category = ProductCategory(name="Account Category")
+    >>> account_category.accounting = True
+    >>> account_category.account_revenue = accounts['revenue']
+    >>> account_category.save()
+
+Create product::
+
+    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
+    >>> template = ProductTemplate()
+    >>> template.name = 'product'
+    >>> template.default_uom = unit
+    >>> template.type = 'goods'
+    >>> template.salable = True
+    >>> template.list_price = Decimal('10')
+    >>> template.account_category = account_category
+    >>> template.save()
+    >>> product, = template.products
+
+Sale some products::
+
+    >>> sale = Sale()
+    >>> sale.party = customer
+    >>> sale.invoice_method = 'order'
+    >>> sale_line = sale.lines.new()
+    >>> sale_line.product = product
+    >>> sale_line.quantity = 2.0
+    >>> sale.click('quote')
+    >>> sales = [sale]
+
+Make another sale::
+
+    >>> sale, = Sale.duplicate([sale])
+    >>> sale.click('quote')
+    >>> sales.append(sale)
+
+Confirm both sales::
+
+    >>> Sale.click(sales, 'confirm')
+    >>> state, = set(s.state for s in sales)
+    >>> state
+    'processing'
+
+Check the invoices::
+
+    >>> invoice, = Invoice.find([('party', '=', customer.id)])
+
+Deleting the invoice keeps same grouping::
+
+    >>> invoice.delete()
+    >>> invoice, = Invoice.find([('party', '=', customer.id)])