diff --git a/addons/stock_invoice_directly/wizard/stock_invoice.py b/addons/stock_invoice_directly/wizard/stock_invoice.py
index 5de6490dc0f..82990ccf208 100644
--- a/addons/stock_invoice_directly/wizard/stock_invoice.py
+++ b/addons/stock_invoice_directly/wizard/stock_invoice.py
@@ -31,9 +31,14 @@ class invoice_directly(osv.osv_memory):
         if context is None: context = {}
         result = super(invoice_directly, self).do_partial(cr, uid, ids, context)
         partial = self.browse(cr, uid, ids[0], context)
+        if partial.picking_id.state != 'done' and partial.picking_id.backorder_id:
+            # delivery is not finished, opening invoice on backorder
+            picking = partial.picking_id.backorder_id
+        else:
+            picking = partial.picking_id
         context.update(active_model='stock.picking',
-                       active_ids=[partial.picking_id.id])
-        if partial.picking_id.invoice_state == '2binvoiced':
+                       active_ids=[picking.id])
+        if picking.invoice_state == '2binvoiced':
             return {
                 'name': 'Create Invoice',
                 'view_type': 'form',