diff --git a/__init__.py b/__init__.py
index 1a52ad9..6736367 100644
--- a/__init__.py
+++ b/__init__.py
@@ -14,6 +14,8 @@ from . import production
 from . import location
 from . import move
 from . import price_list
+from . import sale
+from . import account
 
 def register():
     Pool.register(
@@ -75,10 +77,12 @@ def register():
         location.Location,
         move.Move,
         price_list.PriceList,
+        account.Statement,
         module='agronomics', type_='model')
     Pool.register(
         production.ProductionCostPriceDistributionTemplateProductionTemplate,
         plot.CreateNewParcels,
+        sale.WizardAddProduct,
         module='agronomics', type_='wizard')
     Pool.register(
         module='agronomics', type_='report')
diff --git a/account.py b/account.py
new file mode 100644
index 0000000..26886ff
--- /dev/null
+++ b/account.py
@@ -0,0 +1,23 @@
+# The COPYRIGHT file at the top level of this repository contains
+# the full copyright notices and license terms.
+from decimal import Decimal
+from trytond.model import fields
+from trytond.pool import PoolMeta
+
+
+class Statement(metaclass=PoolMeta):
+    __name__ = 'account.statement'
+
+    @fields.depends('journal', 'state', 'lines', 'number_of_lines',
+        'total_amount')
+    def on_change_journal(self):
+        super().on_change_journal()
+        if not self.journal:
+            return
+        if (self.journal.validation == 'amount' and not self.total_amount):
+            self.total_amount = Decimal(0)
+        elif (self.journal.validation == 'number_of_lines' and not
+                self.number_of_lines):
+            self.number_of_lines = 0
+        else:
+            return
diff --git a/sale.py b/sale.py
new file mode 100644
index 0000000..abd6071
--- /dev/null
+++ b/sale.py
@@ -0,0 +1,50 @@
+# The COPYRIGHT file at the top level of this repository contains
+# the full copyright notices and license terms.
+from trytond.pool import PoolMeta, Pool
+
+
+class WizardAddProduct(metaclass=PoolMeta):
+    __name__ = 'sale_pos.add_product'
+
+    def transition_scan_(self):
+        pool = Pool()
+        Product = pool.get('product.product')
+
+        def qty(value):
+            try:
+                return float(value)
+            except ValueError:
+                return False
+
+        product = None
+        value = self.start.input_value
+        quantity = qty(value)
+        if len(value) > 4:
+            quantity = None
+
+        if not quantity:
+            domain = ['OR', ('code','=', value),
+                ('identifiers.code', '=', value),
+                ('name', 'like', '%'+value+'%')]
+            products = Product.search(domain)
+            if not products:
+                return 'start'
+
+            if len(products) > 1:
+                self.choose.products = [x.id for x in products]
+                return 'choose'
+
+            product,  = products
+
+            self.start.last_product = product
+
+        if quantity and self.start.last_product:
+            product = self.start.last_product
+
+        if not product:
+            return 'start'
+
+        lines = self.add_sale_line(self.start.lines, product, quantity)
+        self.start.lines = lines
+        self.add_lines()
+        return 'start'
diff --git a/sale.xml b/sale.xml
new file mode 100644
index 0000000..23768e3
--- /dev/null
+++ b/sale.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!-- This file is part party_comment module for Tryton.
+The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
+<tryton>
+    <data>
+        <record model="ir.ui.view" id="sale_pos_view_form">
+            <field name="model">sale.sale</field>
+            <field name="inherit" ref="sale_pos.sale_pos_view_form"/>
+            <field name="name">sale_pos_form</field>
+        </record>
+    </data>
+</tryton>
diff --git a/tryton.cfg b/tryton.cfg
index 5584f52..b21fbb2 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -13,6 +13,9 @@ depends:
     stock
     account_invoice
     account_invoice_line_standalone
+    sale
+    sale_pos
+    account_statement
 xml:
     plot.xml
     party.xml
@@ -26,3 +29,4 @@ xml:
     contract.xml
     invoice.xml
     history.xml
+    sale.xml
diff --git a/view/sale_pos_form.xml b/view/sale_pos_form.xml
new file mode 100644
index 0000000..529486b
--- /dev/null
+++ b/view/sale_pos_form.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<data>
+    <xpath expr="/form/group[@id='cash']/button[@name='print_ticket']" position="before">
+        <button name="modify_header" icon="tryton-launch"/>
+    </xpath>
+</data>