diff --git a/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_xrechnung.py b/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_xrechnung.py
index 87827d4d843552..4be7ed3be4d509 100644
--- a/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_xrechnung.py
+++ b/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_xrechnung.py
@@ -24,6 +24,8 @@ def _export_invoice_vals(self, invoice):
         # EXTENDS account.edi.xml.ubl_bis3
         vals = super()._export_invoice_vals(invoice)
         vals['vals']['customization_id'] = 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0'
+        if not vals['vals'].get('buyer_reference'):
+            vals['vals']['buyer_reference'] = 'N/A'
         return vals
 
     def _export_invoice_constraints(self, invoice, vals):