diff --git a/MANIFEST.in b/MANIFEST.in
index 44969c7156..d57a2cc5b9 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -8,3 +8,4 @@ include tryton.cfg
 include *.xml
 include *.odt
 include locale/*.po
+include tests/*.rst
diff --git a/tests/scenario_invoice.rst b/tests/scenario_invoice.rst
new file mode 100644
index 0000000000..a26189ed9e
--- /dev/null
+++ b/tests/scenario_invoice.rst
@@ -0,0 +1,261 @@
+================
+Invoice Scenario
+================
+
+Imports::
+    >>> import datetime
+    >>> from dateutil.relativedelta import relativedelta
+    >>> from decimal import Decimal
+    >>> from operator import attrgetter
+    >>> from proteus import config, Model, Wizard
+    >>> today = datetime.date.today()
+
+Create database::
+
+    >>> config = config.set_trytond()
+    >>> config.pool.test = True
+
+Install account_invoice::
+
+    >>> Module = Model.get('ir.module.module')
+    >>> account_invoice_module, = Module.find(
+    ...     [('name', '=', 'account_invoice')])
+    >>> Module.install([account_invoice_module.id], config.context)
+    >>> Wizard('ir.module.module.install_upgrade').execute('upgrade')
+
+Create company::
+
+    >>> Currency = Model.get('currency.currency')
+    >>> CurrencyRate = Model.get('currency.currency.rate')
+    >>> currencies = Currency.find([('code', '=', 'USD')])
+    >>> if not currencies:
+    ...     currency = Currency(name='US Dollar', symbol=u'$', code='USD',
+    ...         rounding=Decimal('0.01'), mon_grouping='[]',
+    ...         mon_decimal_point='.')
+    ...     currency.save()
+    ...     CurrencyRate(date=today + relativedelta(month=1, day=1),
+    ...         rate=Decimal('1.0'), currency=currency).save()
+    ... else:
+    ...     currency, = currencies
+    >>> Company = Model.get('company.company')
+    >>> company_config = Wizard('company.company.config')
+    >>> company_config.execute('company')
+    >>> company = company_config.form
+    >>> company.name = 'Dunder Mifflin'
+    >>> company.currency = currency
+    >>> company_config.execute('add')
+    >>> company, = Company.find([])
+
+Reload the context::
+
+    >>> User = Model.get('res.user')
+    >>> config._context = User.get_preferences(True, config.context)
+
+Create fiscal year::
+
+    >>> FiscalYear = Model.get('account.fiscalyear')
+    >>> Sequence = Model.get('ir.sequence')
+    >>> SequenceStrict = Model.get('ir.sequence.strict')
+    >>> fiscalyear = FiscalYear(name=str(today.year))
+    >>> fiscalyear.start_date = today + relativedelta(month=1, day=1)
+    >>> fiscalyear.end_date = today + relativedelta(month=12, day=31)
+    >>> fiscalyear.company = company
+    >>> post_move_seq = Sequence(name=str(today.year), code='account.move',
+    ...     company=company)
+    >>> post_move_seq.save()
+    >>> fiscalyear.post_move_sequence = post_move_seq
+    >>> invoice_seq = SequenceStrict(name=str(today.year),
+    ...     code='account.invoice', company=company)
+    >>> invoice_seq.save()
+    >>> fiscalyear.out_invoice_sequence = invoice_seq
+    >>> fiscalyear.in_invoice_sequence = invoice_seq
+    >>> fiscalyear.out_credit_note_sequence = invoice_seq
+    >>> fiscalyear.in_credit_note_sequence = invoice_seq
+    >>> fiscalyear.save()
+    >>> FiscalYear.create_period([fiscalyear.id], config.context)
+
+Create chart of accounts::
+
+    >>> AccountTemplate = Model.get('account.account.template')
+    >>> Account = Model.get('account.account')
+    >>> account_template, = AccountTemplate.find([('parent', '=', False)])
+    >>> create_chart = Wizard('account.create_chart')
+    >>> create_chart.execute('account')
+    >>> create_chart.form.account_template = account_template
+    >>> create_chart.form.company = company
+    >>> create_chart.execute('create_account')
+    >>> receivable, = Account.find([
+    ...         ('kind', '=', 'receivable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> payable, = Account.find([
+    ...         ('kind', '=', 'payable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> revenue, = Account.find([
+    ...         ('kind', '=', 'revenue'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> expense, = Account.find([
+    ...         ('kind', '=', 'expense'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> account_tax, = Account.find([
+    ...         ('kind', '=', 'other'),
+    ...         ('company', '=', company.id),
+    ...         ('name', '=', 'Main Tax'),
+    ...         ])
+    >>> create_chart.form.account_receivable = receivable
+    >>> create_chart.form.account_payable = payable
+    >>> create_chart.execute('create_properties')
+
+Create tax::
+
+    >>> TaxCode = Model.get('account.tax.code')
+    >>> Tax = Model.get('account.tax')
+    >>> tax = Tax()
+    >>> tax.name = 'Tax'
+    >>> tax.description = 'Tax'
+    >>> tax.type = 'percentage'
+    >>> tax.percentage = Decimal(10)
+    >>> tax.invoice_account = account_tax
+    >>> tax.credit_note_account = account_tax
+    >>> invoice_base_code = TaxCode(name='invoice base')
+    >>> invoice_base_code.save()
+    >>> tax.invoice_base_code = invoice_base_code
+    >>> invoice_tax_code = TaxCode(name='invoice tax')
+    >>> invoice_tax_code.save()
+    >>> tax.invoice_tax_code = invoice_tax_code
+    >>> credit_note_base_code = TaxCode(name='credit note base')
+    >>> credit_note_base_code.save()
+    >>> tax.credit_note_base_code = credit_note_base_code
+    >>> credit_note_tax_code = TaxCode(name='credit note tax')
+    >>> credit_note_tax_code.save()
+    >>> tax.credit_note_tax_code = credit_note_tax_code
+    >>> tax.save()
+
+Create party::
+
+    >>> Party = Model.get('party.party')
+    >>> party = Party(name='Party')
+    >>> party.save()
+
+Create product::
+
+    >>> ProductUom = Model.get('product.uom')
+    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
+    >>> Product = Model.get('product.product')
+    >>> product = Product()
+    >>> product.name = 'product'
+    >>> product.default_uom = unit
+    >>> product.type = 'service'
+    >>> product.list_price = Decimal('40')
+    >>> product.cost_price = Decimal('25')
+    >>> product.account_expense = expense
+    >>> product.account_revenue = revenue
+    >>> product.customer_taxes.append(tax)
+    >>> product.save()
+
+Create payment term::
+
+    >>> PaymentTerm = Model.get('account.invoice.payment_term')
+    >>> PaymentTermLine = Model.get('account.invoice.payment_term.line')
+    >>> payment_term = PaymentTerm(name='Term')
+    >>> payment_term_line = PaymentTermLine(type='percent', days=20,
+    ...     percentage=Decimal(50))
+    >>> payment_term.lines.append(payment_term_line)
+    >>> payment_term_line = PaymentTermLine(type='remainder', days=40)
+    >>> payment_term.lines.append(payment_term_line)
+    >>> payment_term.save()
+
+Create invoice::
+
+    >>> Invoice = Model.get('account.invoice')
+    >>> InvoiceLine = Model.get('account.invoice.line')
+    >>> invoice = Invoice()
+    >>> invoice.party = party
+    >>> invoice.payment_term = payment_term
+    >>> line = InvoiceLine()
+    >>> invoice.lines.append(line)
+    >>> line.product = product
+    >>> line.quantity = 5
+    >>> line = InvoiceLine()
+    >>> invoice.lines.append(line)
+    >>> line.account = revenue
+    >>> line.description = 'Test'
+    >>> line.quantity = 1
+    >>> line.unit_price = Decimal(20)
+    >>> invoice.untaxed_amount == Decimal(220)
+    True
+    >>> invoice.tax_amount == Decimal(20)
+    True
+    >>> invoice.total_amount == Decimal(240)
+    True
+    >>> invoice.save()
+    >>> Invoice.post([invoice.id], config.context)
+    >>> invoice.reload()
+    >>> invoice.state
+    u'posted'
+    >>> invoice.untaxed_amount == Decimal(220)
+    True
+    >>> invoice.tax_amount == Decimal(20)
+    True
+    >>> invoice.total_amount == Decimal(240)
+    True
+    >>> receivable.reload()
+    >>> (receivable.debit, receivable.credit) == \
+    ... (Decimal(240), Decimal(0))
+    True
+    >>> revenue.reload()
+    >>> (revenue.debit, revenue.credit) == \
+    ... (Decimal(0), Decimal(220))
+    True
+    >>> account_tax.reload()
+    >>> (account_tax.debit, account_tax.credit) == \
+    ... (Decimal(0), Decimal(20))
+    True
+    >>> invoice_base_code.reload()
+    >>> invoice_base_code.sum == Decimal(200)
+    True
+    >>> invoice_tax_code.reload()
+    >>> invoice_tax_code.sum == Decimal(20)
+    True
+    >>> credit_note_base_code.reload()
+    >>> credit_note_base_code.sum == Decimal(0)
+    True
+    >>> credit_note_tax_code.reload()
+    >>> credit_note_tax_code.sum == Decimal(0)
+    True
+
+Credit invoice with refund::
+
+    >>> credit = Wizard('account.invoice.credit', [invoice])
+    >>> credit.form.with_refund = True
+    >>> credit.execute('credit')
+    >>> invoice.reload()
+    >>> invoice.state
+    u'paid'
+    >>> receivable.reload()
+    >>> (receivable.debit, receivable.credit) == \
+    ... (Decimal(240), Decimal(240))
+    True
+    >>> revenue.reload()
+    >>> (revenue.debit, revenue.credit) == \
+    ... (Decimal(220), Decimal(220))
+    True
+    >>> account_tax.reload()
+    >>> (account_tax.debit, account_tax.credit) == \
+    ... (Decimal(20), Decimal(20))
+    True
+    >>> invoice_base_code.reload()
+    >>> invoice_base_code.sum == Decimal(200)
+    True
+    >>> invoice_tax_code.reload()
+    >>> invoice_tax_code.sum == Decimal(20)
+    True
+    >>> credit_note_base_code.reload()
+    >>> credit_note_base_code.sum == Decimal(200)
+    True
+    >>> credit_note_tax_code.reload()
+    >>> credit_note_tax_code.sum == Decimal(20)
+    True
diff --git a/tests/scenario_invoice_supplier.rst b/tests/scenario_invoice_supplier.rst
new file mode 100644
index 0000000000..a8c5c0e7ac
--- /dev/null
+++ b/tests/scenario_invoice_supplier.rst
@@ -0,0 +1,242 @@
+=========================
+Invoice Supplier Scenario
+=========================
+
+Imports::
+    >>> import datetime
+    >>> from dateutil.relativedelta import relativedelta
+    >>> from decimal import Decimal
+    >>> from operator import attrgetter
+    >>> from proteus import config, Model, Wizard
+    >>> today = datetime.date.today()
+
+Create database::
+
+    >>> config = config.set_trytond()
+    >>> config.pool.test = True
+
+Install account_invoice::
+
+    >>> Module = Model.get('ir.module.module')
+    >>> account_invoice_module, = Module.find(
+    ...     [('name', '=', 'account_invoice')])
+    >>> Module.install([account_invoice_module.id], config.context)
+    >>> Wizard('ir.module.module.install_upgrade').execute('upgrade')
+
+Create company::
+
+    >>> Currency = Model.get('currency.currency')
+    >>> CurrencyRate = Model.get('currency.currency.rate')
+    >>> currencies = Currency.find([('code', '=', 'USD')])
+    >>> if not currencies:
+    ...     currency = Currency(name='US Dollar', symbol=u'$', code='USD',
+    ...         rounding=Decimal('0.01'), mon_grouping='[]',
+    ...         mon_decimal_point='.')
+    ...     currency.save()
+    ...     CurrencyRate(date=today + relativedelta(month=1, day=1),
+    ...         rate=Decimal('1.0'), currency=currency).save()
+    ... else:
+    ...     currency, = currencies
+    >>> Company = Model.get('company.company')
+    >>> company_config = Wizard('company.company.config')
+    >>> company_config.execute('company')
+    >>> company = company_config.form
+    >>> company.name = 'Dunder Mifflin'
+    >>> company.currency = currency
+    >>> company_config.execute('add')
+    >>> company, = Company.find([])
+
+Reload the context::
+
+    >>> User = Model.get('res.user')
+    >>> config._context = User.get_preferences(True, config.context)
+
+Create fiscal year::
+
+    >>> FiscalYear = Model.get('account.fiscalyear')
+    >>> Sequence = Model.get('ir.sequence')
+    >>> SequenceStrict = Model.get('ir.sequence.strict')
+    >>> fiscalyear = FiscalYear(name=str(today.year))
+    >>> fiscalyear.start_date = today + relativedelta(month=1, day=1)
+    >>> fiscalyear.end_date = today + relativedelta(month=12, day=31)
+    >>> fiscalyear.company = company
+    >>> post_move_seq = Sequence(name=str(today.year), code='account.move',
+    ...     company=company)
+    >>> post_move_seq.save()
+    >>> fiscalyear.post_move_sequence = post_move_seq
+    >>> invoice_seq = SequenceStrict(name=str(today.year),
+    ...     code='account.invoice', company=company)
+    >>> invoice_seq.save()
+    >>> fiscalyear.out_invoice_sequence = invoice_seq
+    >>> fiscalyear.in_invoice_sequence = invoice_seq
+    >>> fiscalyear.out_credit_note_sequence = invoice_seq
+    >>> fiscalyear.in_credit_note_sequence = invoice_seq
+    >>> fiscalyear.save()
+    >>> FiscalYear.create_period([fiscalyear.id], config.context)
+
+Create chart of accounts::
+
+    >>> AccountTemplate = Model.get('account.account.template')
+    >>> Account = Model.get('account.account')
+    >>> account_template, = AccountTemplate.find([('parent', '=', False)])
+    >>> create_chart = Wizard('account.create_chart')
+    >>> create_chart.execute('account')
+    >>> create_chart.form.account_template = account_template
+    >>> create_chart.form.company = company
+    >>> create_chart.execute('create_account')
+    >>> receivable, = Account.find([
+    ...         ('kind', '=', 'receivable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> payable, = Account.find([
+    ...         ('kind', '=', 'payable'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> revenue, = Account.find([
+    ...         ('kind', '=', 'revenue'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> expense, = Account.find([
+    ...         ('kind', '=', 'expense'),
+    ...         ('company', '=', company.id),
+    ...         ])
+    >>> account_tax, = Account.find([
+    ...         ('kind', '=', 'other'),
+    ...         ('company', '=', company.id),
+    ...         ('name', '=', 'Main Tax'),
+    ...         ])
+    >>> create_chart.form.account_receivable = receivable
+    >>> create_chart.form.account_payable = payable
+    >>> create_chart.execute('create_properties')
+
+Create tax::
+
+    >>> TaxCode = Model.get('account.tax.code')
+    >>> Tax = Model.get('account.tax')
+    >>> tax = Tax()
+    >>> tax.name = 'Tax'
+    >>> tax.description = 'Tax'
+    >>> tax.type = 'percentage'
+    >>> tax.percentage = Decimal(10)
+    >>> tax.invoice_account = account_tax
+    >>> tax.credit_note_account = account_tax
+    >>> invoice_base_code = TaxCode(name='invoice base')
+    >>> invoice_base_code.save()
+    >>> tax.invoice_base_code = invoice_base_code
+    >>> invoice_tax_code = TaxCode(name='invoice tax')
+    >>> invoice_tax_code.save()
+    >>> tax.invoice_tax_code = invoice_tax_code
+    >>> credit_note_base_code = TaxCode(name='credit note base')
+    >>> credit_note_base_code.save()
+    >>> tax.credit_note_base_code = credit_note_base_code
+    >>> credit_note_tax_code = TaxCode(name='credit note tax')
+    >>> credit_note_tax_code.save()
+    >>> tax.credit_note_tax_code = credit_note_tax_code
+    >>> tax.save()
+
+Create party::
+
+    >>> Party = Model.get('party.party')
+    >>> party = Party(name='Party')
+    >>> party.save()
+
+Create product::
+
+    >>> ProductUom = Model.get('product.uom')
+    >>> unit, = ProductUom.find([('name', '=', 'Unit')])
+    >>> Product = Model.get('product.product')
+    >>> product = Product()
+    >>> product.name = 'product'
+    >>> product.default_uom = unit
+    >>> product.type = 'service'
+    >>> product.list_price = Decimal('40')
+    >>> product.cost_price = Decimal('20')
+    >>> product.account_expense = expense
+    >>> product.account_revenue = revenue
+    >>> product.supplier_taxes.append(tax)
+    >>> product.save()
+
+Create payment term::
+
+    >>> PaymentTerm = Model.get('account.invoice.payment_term')
+    >>> PaymentTermLine = Model.get('account.invoice.payment_term.line')
+    >>> payment_term = PaymentTerm(name='Term')
+    >>> payment_term_line = PaymentTermLine(type='remainder')
+    >>> payment_term.lines.append(payment_term_line)
+    >>> payment_term.save()
+
+Create invoice::
+
+    >>> Invoice = Model.get('account.invoice')
+    >>> InvoiceLine = Model.get('account.invoice.line')
+    >>> invoice = Invoice()
+    >>> invoice.type = 'in_invoice'
+    >>> invoice.party = party
+    >>> invoice.payment_term = payment_term
+    >>> invoice.invoice_date = today
+    >>> line = InvoiceLine()
+    >>> invoice.lines.append(line)
+    >>> line.product = product
+    >>> line.quantity = 5
+    >>> line = InvoiceLine()
+    >>> invoice.lines.append(line)
+    >>> line.account = expense
+    >>> line.description = 'Test'
+    >>> line.quantity = 1
+    >>> line.unit_price = Decimal(10)
+    >>> invoice.untaxed_amount == Decimal(110)
+    True
+    >>> invoice.tax_amount == Decimal(10)
+    True
+    >>> invoice.total_amount == Decimal(120)
+    True
+    >>> invoice.save()
+    >>> Invoice.post([invoice.id], config.context)
+    >>> invoice.reload()
+    >>> invoice.state
+    u'posted'
+    >>> invoice.untaxed_amount == Decimal(110)
+    True
+    >>> invoice.tax_amount == Decimal(10)
+    True
+    >>> invoice.total_amount == Decimal(120)
+    True
+    >>> payable.reload()
+    >>> (payable.debit, payable.credit) == \
+    ... (Decimal(0), Decimal(120))
+    True
+    >>> expense.reload()
+    >>> (expense.debit, expense.credit) == \
+    ... (Decimal(110), Decimal(0))
+    True
+    >>> account_tax.reload()
+    >>> (account_tax.debit, account_tax.credit) == \
+    ... (Decimal(10), Decimal(0))
+    True
+    >>> invoice_base_code.reload()
+    >>> invoice_base_code.sum == Decimal(100)
+    True
+    >>> invoice_tax_code.reload()
+    >>> invoice_tax_code.sum == Decimal(10)
+    True
+    >>> credit_note_base_code.reload()
+    >>> credit_note_base_code.sum == Decimal(0)
+    True
+    >>> credit_note_tax_code.reload()
+    >>> credit_note_tax_code.sum == Decimal(0)
+    True
+
+Credit invoice::
+
+    >>> credit = Wizard('account.invoice.credit', [invoice])
+    >>> credit.form.with_refund = False
+    >>> credit.execute('credit')
+    >>> credit_note, = Invoice.find([('type', '=', 'in_credit_note')])
+    >>> credit_note.state
+    u'draft'
+    >>> credit_note.untaxed_amount == invoice.untaxed_amount
+    True
+    >>> credit_note.tax_amount == invoice.tax_amount
+    True
+    >>> credit_note.total_amount == invoice.total_amount
+    True
diff --git a/tests/test_account_invoice.py b/tests/test_account_invoice.py
index 5512f7429b..6fdfcbdc91 100644
--- a/tests/test_account_invoice.py
+++ b/tests/test_account_invoice.py
@@ -10,12 +10,14 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import unittest
+import doctest
 import datetime
 from decimal import Decimal
 import trytond.tests.test_tryton
 from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT, test_view,\
         test_depends
 from trytond.transaction import Transaction
+from trytond.backend.sqlite.database import Database as SQLiteDatabase
 
 
 class AccountInvoiceTestCase(unittest.TestCase):
@@ -91,10 +93,26 @@ class AccountInvoiceTestCase(unittest.TestCase):
                     ])
 
 
+def doctest_dropdb(test):
+    database = SQLiteDatabase().connect()
+    cursor = database.cursor(autocommit=True)
+    try:
+        database.drop(cursor, ':memory:')
+        cursor.commit()
+    finally:
+        cursor.close()
+
+
 def suite():
     suite = trytond.tests.test_tryton.suite()
     suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
         AccountInvoiceTestCase))
+    suite.addTests(doctest.DocFileSuite('scenario_invoice.rst',
+            setUp=doctest_dropdb, tearDown=doctest_dropdb, encoding='utf-8',
+            optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
+    suite.addTests(doctest.DocFileSuite('scenario_invoice_supplier.rst',
+            setUp=doctest_dropdb, tearDown=doctest_dropdb, encoding='utf-8',
+            optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
     return suite
 
 if __name__ == '__main__':