diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 4ed1219caaa..9c8f095a2be 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -1234,7 +1234,7 @@ class account_move_line(osv.osv):
         period = period_obj.browse(cr, uid, period_id, context=context)
         for (state,) in result:
             if state == 'done':
-                raise osv.except_osv(_('Error!'), _('You can not add/modify entries in a closed period %s of journal %s.') % (period.name,journal.name))
+                raise osv.except_osv(_('Error!'), _('You can not add/modify entries in a closed period %s of journal %s.') % (period.name, journal.name))
         if not result:
             jour_period_obj.create(cr, uid, {
                 'name': (journal.code or journal.name)+':'+(period.name or ''),
diff --git a/addons/mail/wizard/mail_compose_message.py b/addons/mail/wizard/mail_compose_message.py
index 3f2db49b4b0..78d31b0963e 100644
--- a/addons/mail/wizard/mail_compose_message.py
+++ b/addons/mail/wizard/mail_compose_message.py
@@ -263,7 +263,7 @@ class mail_compose_message(osv.TransientModel):
             # static wizard (mail.message) values
             mail_values = {
                 'subject': wizard.subject,
-                'body': wizard.body,
+                'body': wizard.body or '',
                 'parent_id': wizard.parent_id and wizard.parent_id.id,
                 'partner_ids': [partner.id for partner in wizard.partner_ids],
                 'attachment_ids': [attach.id for attach in wizard.attachment_ids],
diff --git a/addons/mrp_operations/mrp_operations.py b/addons/mrp_operations/mrp_operations.py
index 3c3e2c92268..ec087cf6877 100644
--- a/addons/mrp_operations/mrp_operations.py
+++ b/addons/mrp_operations/mrp_operations.py
@@ -336,7 +336,7 @@ class mrp_production(osv.osv):
             for po in self.browse(cr, uid, ids, context=context):
                 direction[po.id] = cmp(po.date_start, vals.get('date_start', False))
         result = super(mrp_production, self).write(cr, uid, ids, vals, context=context)
-        if (vals.get('workcenter_lines', False) or vals.get('date_start', False)) and update:
+        if (vals.get('workcenter_lines', False) or vals.get('date_start', False) or vals.get('date_planned', False)) and update:
             self._compute_planned_workcenter(cr, uid, ids, context=context, mini=mini)
         for d in direction:
             if direction[d] == 1:
diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index 0298bd3a90a..6b159d8140c 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -401,7 +401,7 @@ def is_leaf(element, internal=False):
         and len(element) == 3 \
         and element[1] in INTERNAL_OPS \
         and ((isinstance(element[0], basestring) and element[0])
-             or element in (TRUE_LEAF, FALSE_LEAF))
+             or tuple(element) in (TRUE_LEAF, FALSE_LEAF))
 
 
 # --------------------------------------------------