diff --git a/allocation.py b/allocation.py
index f39c9c893c..cb75df71b5 100644
--- a/allocation.py
+++ b/allocation.py
@@ -29,12 +29,13 @@ class Allocation(ModelSQL, ModelView):
         return 100
 
     @classmethod
-    def write(cls, allocations, values):
+    def write(cls, *args):
         Work = Pool().get('project.work')
-        super(Allocation, cls).write(allocations, values)
+        super(Allocation, cls).write(*args)
 
         works = Work.search([
-                ('allocations', 'in', [a.id for a in allocations]),
+                ('allocations', 'in',
+                    [a.id for allocations in args[::2] for a in allocations]),
                 ])
 
         for work in works:
diff --git a/work.py b/work.py
index 824ccda643..98c0dd9c4c 100644
--- a/work.py
+++ b/work.py
@@ -536,17 +536,19 @@ class Work:
             self.parent.compute_dates()
 
     @classmethod
-    def write(cls, works, values):
-        super(Work, cls).write(works, values)
+    def write(cls, *args):
+        super(Work, cls).write(*args)
 
-        if 'effort' in values:
-            for work in works:
-                work.reset_leveling()
-        fields = ('constraint_start_time', 'constraint_finish_time',
-                  'effort')
-        if reduce(lambda x, y: x or y in values, fields, False):
-            for work in works:
-                work.compute_dates()
+        actions = iter(args)
+        for works, values in zip(actions, actions):
+            if 'effort' in values:
+                for work in works:
+                    work.reset_leveling()
+            fields = ('constraint_start_time', 'constraint_finish_time',
+                      'effort')
+            if reduce(lambda x, y: x or y in values, fields, False):
+                for work in works:
+                    work.compute_dates()
 
     @classmethod
     def create(cls, vlist):
@@ -580,11 +582,14 @@ class PredecessorSuccessor(ModelSQL):
             ondelete='CASCADE', required=True, select=True)
 
     @classmethod
-    def write(cls, pred_succs, values):
+    def write(cls, *args):
         Work = Pool().get('project.work')
-        super(PredecessorSuccessor, cls).write(pred_succs, values)
+        super(PredecessorSuccessor, cls).write(*args)
 
-        works = Work.browse(values.itervalues())
+        work_ids = [v for values in args[1::2]
+            for k, v in values.itervalues()
+            if k in ('predecessor', 'successor')]
+        works = Work.browse(work_ids)
         for work in works:
             work.reset_leveling()
         for work in works: