diff --git a/modules/automation/automation.py b/modules/automation/automation.py
index da45a96..ebd3eee 100644
--- a/modules/automation/automation.py
+++ b/modules/automation/automation.py
@@ -323,6 +323,7 @@ class AutomationDocument(ModelSQL, ModelView, Workflow):
                                 d.tol_min = 0
                                 d.tol_max = 0
                                 d.incoterm = None
+                                d.reference = str(sale.id)
                                 ct.contracts = [d]
                                 ContractFactory.create_contracts(
                                     ct.contracts,