Use dedicated model for products and lots by locations

issue9874
review314911002

product.py

@@ -94,6 +94,8 @@ class Template(
         fields.Many2One('product.uom.category', 'Default UOM Category'),
         'on_change_with_default_uom_category',
         searcher='search_default_uom_category')
+    default_uom_digits = fields.Function(fields.Integer("Default Unit Digits"),
+        'on_change_with_default_uom_digits')
     categories = fields.Many2Many(
         'product.template-product.category', 'template', 'category',
         "Categories",
@@ -213,6 +215,11 @@ class Template(
         return [('default_uom.category' + clause[0].lstrip(name),)
             + tuple(clause[1:])]
 
+    @fields.depends('default_uom')
+    def on_change_with_default_uom_digits(self, name=None):
+        if self.default_uom:
+            return self.default_uom.digits
+
     @classmethod
     def _new_code(cls):
         pool = Pool()