Configuration default value from XML data (not default method)

configuration.py

@@ -2,6 +2,7 @@
 # copyright notices and license terms.
 from trytond.model import fields
 from trytond.pool import PoolMeta
+from trytond.pyson import Eval, Bool
 
 __all__ = ['Configuration']
 __metaclass__ = PoolMeta
@@ -12,8 +13,6 @@ class Configuration:
     compute_quantity_method = fields.Property(fields.Selection([
             ('quantity', 'Quantity'),
             ('forecast_quantity', 'Forecast Quantity'),
-            ], 'Compute Quantity Method'))
-
-    @staticmethod
-    def default_compute_quantity_method():
-        return 'quantity'
+            ], 'Compute Quantity Method', states={
+            'required': Bool(Eval('context', {}).get('company')),
+            }))

configuration.xml

@@ -3,12 +3,16 @@
 copyright notices and license terms. -->
 <tryton>
     <data>
-        <!-- stock.configuration -->
         <record model="ir.ui.view" id="stock_configuration_view_form">
             <field name="model">stock.configuration</field>
-            <field name="inherit"
-                ref="stock.stock_configuration_view_form"/>
+            <field name="inherit" ref="stock.stock_configuration_view_form"/>
             <field name="name">configuration_form</field>
         </record>
+
+        <record model="ir.property" id="property_compute_quantity_method">
+            <field name="field"
+                search="[('model.model', '=', 'stock.configuration'), ('name', '=', 'compute_quantity_method')]" />
+            <field name="value">,quantity</field>
+        </record>
     </data>
 </tryton>

locale/ca_ES.po

@@ -2,14 +2,6 @@
 msgid ""
 msgstr "Content-Type: text/plain; charset=utf-8\n"
 
-msgctxt "error:stock.supply.by.product.wizard:"
-msgid ""
-"The computed quantity method is not configured. Please, configure it before "
-"run this wizard."
-msgstr ""
-"El mètode de càlcul de quantitat no està configurat. Si us plau, configureu-"
-"lo abans d'executar aquest assistent."
-
 msgctxt "field:stock.configuration,compute_quantity_method:"
 msgid "Compute Quantity Method"
 msgstr "Mètode de càlcul de quantitat"

locale/es_ES.po

@@ -2,14 +2,6 @@
 msgid ""
 msgstr "Content-Type: text/plain; charset=utf-8\n"
 
-msgctxt "error:stock.supply.by.product.wizard:"
-msgid ""
-"The computed quantity method is not configured. Please, configure it before "
-"run this wizard."
-msgstr ""
-"El método de cálculo de cantidad no está configurado. Por favor, configurelo"
-" antes de usar este asistente."
-
 msgctxt "field:stock.configuration,compute_quantity_method:"
 msgid "Compute Quantity Method"
 msgstr "Método de cálculo de cantidad"

stock_supply_by_product.py

@@ -50,15 +50,6 @@ class StockSupplyByProductWizard(Wizard):
             ])
     request = StateAction('stock_supply.act_purchase_request_form')
 
-    @classmethod
-    def __setup__(cls):
-        super(StockSupplyByProductWizard, cls).__setup__()
-        cls._error_messages.update({
-                'compute_quantity_method_error': 'The computed quantity '
-                'method is not configured. Please, configure it before run '
-                'this wizard.',
-                })
-
     def do_request(self, action):
         pool = Pool()
         PurchaseRequest = pool.get('purchase.request')
@@ -70,8 +61,6 @@ class StockSupplyByProductWizard(Wizard):
         products = Products.browse(products)
         supplier = self.start.supplier
         compute_quantity_method = Configuration(1).compute_quantity_method
-        if not compute_quantity_method:
-            self.raise_user_error('compute_quantity_method_error')
 
         vlist = []
         for product in products: