Allow to configure required registration numbers.

This commit refs #10269

load.py

@@ -875,17 +875,20 @@ class CreateLoadDataMixin(object):
             'invisible': Bool(Eval('load_order'))
         },
         depends=['load_order', 'load_purchasable'])
-    vehicle_number = fields.Char('Vehicle reg. number', required=True,
+    vehicle_number = fields.Char('Vehicle reg. number',
         states={
-            'required': ~Eval('load_order'),
+            'required': ~Eval('load_order') & Bool(Eval('vehicle_required')),
             'invisible': Bool(Eval('load_order'))
         },
-        depends=['load_order'])
+        depends=['load_order', 'vehicle_required'])
+    vehicle_required = fields.Boolean('Vehicle required')
     trailer_number = fields.Char('Trailer reg. number',
         states={
-            'invisible': Bool(Eval('load_order'))
+            'invisible': Bool(Eval('load_order')),
+            'required': ~Eval('load_order') & Bool(Eval('trailer_required')),
         },
-        depends=['load_order'])
+        depends=['load_order', 'trailer_required'])
+    trailer_required = fields.Boolean('Trailer required')
     load_purchasable = fields.Boolean('Load purchasable',
         states={'invisible': Bool(Eval('load_order'))},
         depends=['load_order'])

sale.py

@@ -237,8 +237,14 @@ class CreateLoad(Wizard):
     def default_sale_data(self, fields):
         pool = Pool()
         Sale = pool.get('sale.sale')
+        Conf = pool.get('carrier.configuration')
 
-        res = {'lines': []}
+        conf = Conf(1)
+        res = {
+            'vehicle_required': conf.vehicle_required,
+            'trailer_required': conf.trailer_required,
+            'lines': []
+        }
         sale = Sale(Transaction().context.get('active_id'))
         if sale.ul_quantity_to_load <= 0:
             self.raise_user_error('nothing_load')