diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 34a18555049..6139f36bb19 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -1722,17 +1722,20 @@ class AccountPartialReconcile(models.Model):
             return self
         #check if the reconcilation is full
         #first, gather all journal items involved in the reconciliation just created
-        partial_rec_set = OrderedDict.fromkeys([x for x in self])
         aml_set = aml_to_balance = self.env['account.move.line']
         total_debit = 0
         total_credit = 0
         total_amount_currency = 0
         #make sure that all partial reconciliations share the same secondary currency otherwise it's not
         #possible to compute the exchange difference entry and it has to be done manually.
-        currency = list(partial_rec_set)[0].currency_id
+        currency = self[0].currency_id
         maxdate = '0000-00-00'
 
-        for partial_rec in partial_rec_set:
+        seen = set()
+        todo = set(self)
+        while todo:
+            partial_rec = todo.pop()
+            seen.add(partial_rec)
             if partial_rec.currency_id != currency:
                 #no exchange rate entry will be created
                 currency = None
@@ -1751,13 +1754,15 @@ class AccountPartialReconcile(models.Model):
                         #currency is recorded on the partial rec and in order to check if the reconciliation is total, we need to convert the
                         #aml.balance in that foreign currency
                         total_amount_currency += aml.company_id.currency_id.with_context(date=aml.date).compute(aml.balance, partial_rec.currency_id)
+
                 for x in aml.matched_debit_ids | aml.matched_credit_ids:
-                    partial_rec_set[x] = None
-        partial_rec_ids = [x.id for x in partial_rec_set]
+                    if x not in seen:
+                        todo.add(x)
+
+        partial_rec_ids = [x.id for x in seen]
         aml_ids = aml_set.ids
         #then, if the total debit and credit are equal, or the total amount in currency is 0, the reconciliation is full
         digits_rounding_precision = aml_set[0].company_id.currency_id.rounding
-
         if (currency and float_is_zero(total_amount_currency, precision_rounding=currency.rounding)) or float_compare(total_debit, total_credit, precision_rounding=digits_rounding_precision) == 0:
             exchange_move_id = False
             exchange_partial_rec_id = False