diff --git a/addons/l10n_be_invoice_bba/invoice.py b/addons/l10n_be_invoice_bba/invoice.py
index a23dabd7c51..97cc4ed5d7c 100644
--- a/addons/l10n_be_invoice_bba/invoice.py
+++ b/addons/l10n_be_invoice_bba/invoice.py
@@ -199,6 +199,18 @@ class account_invoice(osv.osv):
                               '\nPlease create manually a unique BBA Structured Communication.'))
         return super(account_invoice, self).write(cr, uid, ids, vals, context)
 
+    def copy(self, cr, uid, ids, default=None, context=None):
+        default = default or {}
+        invoice = self.browse(cr, uid, ids, context=context)
+        reference_type = invoice.reference_type or 'none'
+        default['reference_type'] = reference_type
+        if reference_type == 'bba':
+            partner = invoice.partner_id
+            default['reference'] = self.generate_bbacomm(cr, uid, ids,
+                invoice.type, reference_type,
+                partner.id, '', context=context)['value']['reference']
+        return super(account_invoice, self).copy(cr, uid, ids, default, context=context)
+
     _columns = {
         'reference': fields.char('Communication', size=64, help="The partner reference of this invoice."),
         'reference_type': fields.selection(_get_reference_type, 'Communication Type',