diff --git a/l10n_es_aeat_mod347/models/mod347.py b/l10n_es_aeat_mod347/models/mod347.py
index 463e2de7bfe..3dc516c4de1 100755
--- a/l10n_es_aeat_mod347/models/mod347.py
+++ b/l10n_es_aeat_mod347/models/mod347.py
@@ -77,6 +77,7 @@ def _partner_record_a_create(self, data, vals):
 
         Create from income (from supplier) invoices
         """
+        vals = vals.copy()
         partner_record_obj = self.env['l10n.es.aeat.mod347.partner_record']
         record = False
         vals['operation_key'] = 'A'
@@ -96,6 +97,7 @@ def _partner_record_b_create(self, data, vals):
 
         Create from outcome (from customer) invoices and cash movements
         """
+        vals = vals.copy()
         partner_record_obj = self.env['l10n.es.aeat.mod347.partner_record']
         cash_record_obj = self.env['l10n.es.aeat.mod347.cash_record']
         records = []