diff --git a/account_statement_cancel_line/statement.py b/account_statement_cancel_line/statement.py
index 88e55126..f87fbd64 100644
--- a/account_statement_cancel_line/statement.py
+++ b/account_statement_cancel_line/statement.py
@@ -27,7 +27,7 @@ class Statement(orm.Model):
 
     """Bank Statement.
 
-    All logic is in the BankStatementLine
+    Minimal changes to allow cancelling single lines.
 
     """
 
@@ -38,3 +38,25 @@ class Statement(orm.Model):
 
     _defaults = {
     }
+
+    def button_confirm_bank(self, cr, uid, ids, context=None):
+        """Change the state on the statement lines. Return super."""
+        st_line_obj = self.pool['account.bank.statement.line']
+        for st_data in self.read(cr, uid, ids, ['line_ids'], context=context):
+            st_line_obj.write(cr, uid, st_data['line_ids'], {
+                'state': 'confirmed'
+            }, context=context)
+
+        return super(Statement, self).button_confirm_bank(
+            cr, uid, ids, context)
+
+    def button_cancel(self, cr, uid, ids, context=None):
+        """Change the state on the statement lines. Return super."""
+        st_line_obj = self.pool['account.bank.statement.line']
+        for st_data in self.read(cr, uid, ids, ['line_ids'], context=context):
+            st_line_obj.write(cr, uid, st_data['line_ids'], {
+                'state': 'draft'
+            }, context=context)
+
+        return super(Statement, self).button_cancel(
+            cr, uid, ids, context)
diff --git a/account_statement_cancel_line/statement_line.py b/account_statement_cancel_line/statement_line.py
index f0cf2226..539b46f5 100644
--- a/account_statement_cancel_line/statement_line.py
+++ b/account_statement_cancel_line/statement_line.py
@@ -52,6 +52,14 @@ class StatementLine(orm.Model):
         the bank-statement-reconcile branch does not).
 
         """
+        if context is None:
+            context = {}
+        local_ctx = context.copy()
+        # if account_constraints is installed, we need to tell it that moves
+        # are being created by a statement, which is OK.
+        # The module tries to prevent direct changes to the moves created by
+        # bank statements.
+        local_ctx['from_parent_object'] = True
         statement_pool = self.pool.get('account.bank.statement')
 
         for st_line in self.browse(cr, uid, ids, context):
@@ -64,13 +72,15 @@ class StatementLine(orm.Model):
             st_line_number = statement_pool.get_next_st_line_number(
                 cr, uid, st_number, st_line, context)
 
+            # We pass the local_ctx so that account_constraints allows us to
+            # work on the moves generated by the bank statement
             statement_pool.create_move_from_st_line(
                 cr,
                 uid,
                 st_line.id,
                 curr_id,
                 st_line_number,
-                context)
+                local_ctx)
             self.write(cr, uid, st_line.id, {
                 'state': 'confirmed'
             }, context)
@@ -83,7 +93,17 @@ class StatementLine(orm.Model):
         module.
 
         """
+        if context is None:
+            context = {}
+        local_ctx = context.copy()
+        # if account_constraints is installed, we need to tell it that moves
+        # are being created by a statement, which is OK.
+        # The module tries to prevent direct changes to the moves created by
+        # bank statements.
+        local_ctx['from_parent_object'] = True
+
         move_pool = self.pool.get('account.move')
+
         set_draft_ids = []
         move_unlink_ids = []
         # harvest ids for various actions
@@ -91,21 +111,23 @@ class StatementLine(orm.Model):
             if st_line.state != 'confirmed':
                 continue
 
-            for line in st_line.move_ids:
+            for move in st_line.move_ids:
                 # We allow for people canceling and removing
                 # the associated payments, which can lead to confirmed
                 # statement lines without an associated move
-                move_unlink_ids.append(line.id)
+                move_unlink_ids.append(move.id)
+                # do we need to check that?
+                if move.state != 'draft':
+                    raise orm.except_orm(
+                        _('Confirmed Journal Entry'),
+                        _('You cannot delete a confirmed Statement Line '
+                          'associated to a Journal Entry that is posted.'))
             set_draft_ids.append(st_line.id)
 
-            if st_line.move_line.state != 'draft':
-                raise orm.except_orm(
-                    _('Confirmed Journal Entry'),
-                    _('You cannot delete a confirmed Statement Line '
-                      'associated to a Journal Entry that is posted.'))
         move_pool.button_cancel(
             cr, uid, move_unlink_ids, context=context)
-        move_pool.unlink(cr, uid, move_unlink_ids, context=context)
+
+        move_pool.unlink(cr, uid, move_unlink_ids, context=local_ctx)
         self.write(
             cr, uid, set_draft_ids, {'state': 'draft'}, context=context)
         return True