diff --git a/addons/l10n_be_invoice_bba/invoice.py b/addons/l10n_be_invoice_bba/invoice.py
index b1db829eddf..947ccb6f71c 100644
--- a/addons/l10n_be_invoice_bba/invoice.py
+++ b/addons/l10n_be_invoice_bba/invoice.py
@@ -180,6 +180,8 @@ class account_invoice(osv.osv):
         return super(account_invoice, self).create(cr, uid, vals, context=context)     
 
     def write(self, cr, uid, ids, vals, context={}):
+        if isinstance(ids, (int, long)):
+            ids = [ids]
         for inv in self.browse(cr, uid, ids, context):    
             if vals.has_key('reference_type'):
                 reference_type = vals['reference_type']