diff --git a/sale_planner/__manifest__.py b/sale_planner/__manifest__.py
index cce9a189..c87d85f2 100644
--- a/sale_planner/__manifest__.py
+++ b/sale_planner/__manifest__.py
@@ -1,7 +1,7 @@
 {
     'name': 'Sale Order Planner',
     'summary': 'Plans order dates and warehouses.',
-    'version': '14.0.1.0.0',
+    'version': '15.0.1.0.0',
     'author': "Hibou Corp.",
     'category': 'Sale',
     'license': 'AGPL-3',
diff --git a/sale_planner/models/resource.py b/sale_planner/models/resource.py
index 07556ce7..de7895aa 100644
--- a/sale_planner/models/resource.py
+++ b/sale_planner/models/resource.py
@@ -15,16 +15,16 @@ class ResourceCalendar(models.Model):
 
         # which method to use for retrieving intervals
         if compute_leaves:
-            get_intervals = partial(self._work_intervals, domain=domain)
+            get_intervals = partial(self._work_intervals_batch, domain=domain)
         else:
-            get_intervals = self._attendance_intervals
+            get_intervals = self._attendance_intervals_batch
 
         if days >= 0:
             found = set()
             delta = timedelta(days=14)
             for n in range(100):
                 dt = day_dt + delta * n
-                for start, stop, meta in get_intervals(dt, dt + delta):
+                for start, stop, meta in get_intervals(dt, dt + delta)[False]:
                     found.add(start.date())
                     if len(found) >= days:
                         return revert(stop)
@@ -36,7 +36,7 @@ class ResourceCalendar(models.Model):
             delta = timedelta(days=14)
             for n in range(100):
                 dt = day_dt - delta * n
-                for start, stop, meta in reversed(get_intervals(dt - delta, dt)):
+                for start, stop, meta in reversed(get_intervals(dt - delta, dt))[False]:
                     found.add(start.date())
                     if len(found) == days:
                         return revert(start)