diff --git a/addons/mrp/wizard/change_production_qty.py b/addons/mrp/wizard/change_production_qty.py
index e9588516a0c..3422edd8cb5 100644
--- a/addons/mrp/wizard/change_production_qty.py
+++ b/addons/mrp/wizard/change_production_qty.py
@@ -68,7 +68,7 @@ class ChangeProductionQty(models.TransientModel):
                                  cycle_number * operation.time_cycle * 100.0 / operation.workcenter_id.time_efficiency)
                 quantity = wo.qty_production - wo.qty_produced
                 if production.product_id.tracking == 'serial':
-                    quantity = 1.0 if float_is_zero(quantity, precision_digits=precision) else 0.0
+                    quantity = 1.0 if not float_is_zero(quantity, precision_digits=precision) else 0.0
                 else:
                     quantity = quantity if (quantity > 0) else 0
                 if float_is_zero(quantity, precision_digits=precision):
diff --git a/odoo/models.py b/odoo/models.py
index 8fb6cc01951..595250b54f2 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -1761,7 +1761,8 @@ class BaseModel(object):
                     order = '"%s" %s' % (order_field, '' if len(order_split) == 1 else order_split[1])
                     orderby_terms.append(order)
             elif order_field in aggregated_fields:
-                orderby_terms.append(order_part)
+                order_split[0] = '"' + order_field + '"'
+                orderby_terms.append(' '.join(order_split))
             else:
                 # Cannot order by a field that will not appear in the results (needs to be grouped or aggregated)
                 _logger.warn('%s: read_group order by `%s` ignored, cannot sort on empty columns (not grouped/aggregated)',