[FIX] resource: Wrong default value for Time Efficiency

The time efficiency cannot be set to 0 otherwise it raised an error
when creating a workorder.

opw:752251

addons/resource/i18n/resource.pot

@@ -319,6 +319,12 @@ msgstr ""
 msgid "This field is used to calculate the the expected duration of a work order at this work center. For example, if a work order takes one hour and the efficiency factor is 100%, then the expected duration will be one hour. If the efficiency factor is 200%, however the expected duration will be 30 minutes."
 msgstr ""
 
+#. module: resource
+#: code:addons/resource/models/resource.py:714
+#, python-format
+msgid "The efficiency factor cannot be equal to 0."
+msgstr ""
+
 #. module: resource
 #: selection:resource.calendar.attendance,dayofweek:0
 msgid "Thursday"

addons/resource/models/resource.py

@@ -706,6 +706,13 @@ class ResourceResource(models.Model):
         help="This field is used to calculate the the expected duration of a work order at this work center. For example, if a work order takes one hour and the efficiency factor is 100%, then the expected duration will be one hour. If the efficiency factor is 200%, however the expected duration will be 30 minutes.")
     calendar_id = fields.Many2one("resource.calendar", string='Working Time', help="Define the schedule of resource")
 
+    @api.multi
+    @api.constrains('time_efficiency')
+    def _check_time_efficiency(self):
+        for record in self:
+            if record.time_efficiency == 0:
+                raise ValidationError(_('The efficiency factor cannot be equal to 0.'))
+
     @api.multi
     def copy(self, default=None):
         self.ensure_one()