diff --git a/issue5575.diff b/issue5575.diff
new file mode 100644
index 0000000..43259b4
--- /dev/null
+++ b/issue5575.diff
@@ -0,0 +1,119 @@
+diff -r 67d5653c0e7a trytond/trytond/modules/stock_supply/__init__.py
+--- a/trytond/trytond/modules/stock_supply/__init__.py	Thu Jun 02 12:40:58 2016 +0200
++++ b/trytond/trytond/modules/stock_supply/__init__.py	Thu Jun 02 12:44:08 2016 +0200
+@@ -13,6 +13,8 @@
+     Pool.register(
+         OrderPoint,
+         Product,
++        ProductSupplier,
++        PurchaseConfiguration,
+         PurchaseRequest,
+         CreatePurchaseRequestStart,
+         CreatePurchaseAskParty,
+diff -r 67d5653c0e7a trytond/trytond/modules/stock_supply/product.py
+--- a/trytond/trytond/modules/stock_supply/product.py	Thu Jun 02 12:40:58 2016 +0200
++++ b/trytond/trytond/modules/stock_supply/product.py	Thu Jun 02 12:44:08 2016 +0200
+@@ -1,9 +1,9 @@
+ #This file is part of Tryton.  The COPYRIGHT file at the top level of
+ #this repository contains the full copyright notices and license terms.
+ from trytond.model import fields
+-from trytond.pool import PoolMeta
++from trytond.pool import Pool, PoolMeta
+ 
+-__all__ = ['Product']
++__all__ = ['Product', 'ProductSupplier']
+ __metaclass__ = PoolMeta
+ 
+ 
+@@ -11,3 +11,15 @@
+     __name__ = "product.product"
+     order_points = fields.One2Many(
+         'stock.order_point', 'product', 'Order Points')
++
++
++class ProductSupplier:
++    __metaclass__ = PoolMeta
++    __name__ = 'purchase.product_supplier'
++
++    def get_supply_period(self):
++        'Return the supply period for the purchase request in days'
++        pool = Pool()
++        Configuration = pool.get('purchase.configuration')
++        supply_period = Configuration(1).supply_period
++        return int(Configuration(1).supply_period) if supply_period else 1
+diff -r 67d5653c0e7a trytond/trytond/modules/stock_supply/purchase_request.py
+--- a/trytond/trytond/modules/stock_supply/purchase_request.py	Thu Jun 02 12:40:58 2016 +0200
++++ b/trytond/trytond/modules/stock_supply/purchase_request.py	Thu Jun 02 12:44:08 2016 +0200
+@@ -10,10 +10,10 @@
+     Button
+ from trytond.pyson import If, In, Eval, Get
+ from trytond.transaction import Transaction
+-from trytond.pool import Pool
++from trytond.pool import Pool, PoolMeta
+ from trytond.tools import grouped_slice
+ 
+-__all__ = ['PurchaseRequest',
++__all__ = ['PurchaseRequest', 'PurchaseConfiguration',
+     'CreatePurchaseRequestStart', 'CreatePurchaseRequest',
+     'CreatePurchaseAskParty', 'CreatePurchase']
+ 
+@@ -21,6 +21,17 @@
+     'readonly': Eval('state') != 'draft',
+     }
+ DEPENDS = ['state']
++__metaclass__ = PoolMeta
++
++
++class PurchaseConfiguration:
++    __name__ = 'purchase.configuration'
++    supply_period = fields.Property(fields.Numeric('Supply Period',
++            help='In number of days', required=True))
++
++    @classmethod
++    def default_supply_period(cls):
++        return 1
+ 
+ 
+ class PurchaseRequest(ModelSQL, ModelView):
+@@ -326,9 +337,8 @@
+ 
+         for product_supplier in product.product_suppliers:
+             supply_date = product_supplier.compute_supply_date(date=today)
+-            # TODO next_day is by default today + 1 but should depends
+-            # on the CRON activity
+-            next_day = today + datetime.timedelta(1)
++            next_day = today + datetime.timedelta(
++                product_supplier.get_supply_period())
+             next_supply_date = product_supplier.compute_supply_date(
+                 date=next_day)
+             if (not min_date) or supply_date < min_date:
+diff -r 67d5653c0e7a trytond/trytond/modules/stock_supply/purchase_request.xml
+--- a/trytond/trytond/modules/stock_supply/purchase_request.xml	Thu Jun 02 12:40:58 2016 +0200
++++ b/trytond/trytond/modules/stock_supply/purchase_request.xml	Thu Jun 02 12:44:08 2016 +0200
+@@ -3,6 +3,12 @@
+ this repository contains the full copyright notices and license terms. -->
+ <tryton>
+     <data>
++        <record model="ir.ui.view" id="purchase_configuration_view_form">
++            <field name="model">purchase.configuration</field>
++            <field name="inherit"
++                ref="purchase.purchase_configuration_view_form"/>
++            <field name="name">purchase_configuration_form</field>
++        </record>
+ 
+         <record model="res.group" id="group_purchase_request">
+             <field name="name">Purchase Request</field>
+diff -r 67d5653c0e7a trytond/trytond/modules/stock_supply/view/purchase_configuration_form.xml
+--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
++++ b/trytond/trytond/modules/stock_supply/view/purchase_configuration_form.xml	Thu Jun 02 12:44:08 2016 +0200
+@@ -0,0 +1,10 @@
++<?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/field[@name='purchase_invoice_method']"
++        position="after">
++        <label name="supply_period"/>
++        <field name="supply_period"/>
++    </xpath>
++</data>
diff --git a/series b/series
index 9238dd3..312dec7 100644
--- a/series
+++ b/series
@@ -102,3 +102,4 @@ workflow-performance.diff
 issue17151002_80001.diff
 #issue027544_2.diff
 #issue027544_1.diff
+issue5575.diff