diff --git a/odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard.py b/odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard.py
index 73a31b4..58d2516 100644
--- a/odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard.py
+++ b/odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard.py
@@ -126,6 +126,8 @@ class AccountVoucherWizardPurchase(models.TransientModel):
             )
             .id
         )
+        if purchase.partner_ref:
+            res["payment_ref"] = purchase.partner_ref
         return res
 
     @api.depends("journal_id", "date", "amount_advance", "journal_currency_id")