diff --git a/odex25_transactions/exp_transaction_documents/models/internal_transaction.py b/odex25_transactions/exp_transaction_documents/models/internal_transaction.py
index e3019eeaf..678bd6d29 100644
--- a/odex25_transactions/exp_transaction_documents/models/internal_transaction.py
+++ b/odex25_transactions/exp_transaction_documents/models/internal_transaction.py
@@ -29,6 +29,7 @@ class InternalTransaction(models.Model):
     def _onchange_type_sender(self):
         if self.to_ids:
             self.to_ids = False
+        if self.partner_id:
             self.partner_id =False
             
     partner_id = fields.Many2one('res.partner', string='Partner', readonly=True,