From 9cce9ef35eeab910ed09df8b198c59074f6ca68f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Thu, 27 Nov 2025 15:14:26 +0100
Subject: [PATCH] Lock only FRST SEPA mandates when processing payment group

This prevents most of the time to consume a sequence number for the group
because the transaction has to restart to lock the mandates.

Closes #14397
---
 modules/account_payment_sepa/payment.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/account_payment_sepa/payment.py b/modules/account_payment_sepa/payment.py
index f45e324914..b86e00cde3 100644
--- a/modules/account_payment_sepa/payment.py
+++ b/modules/account_payment_sepa/payment.py
@@ -215,7 +215,8 @@ class Group(metaclass=PoolMeta):
         if self.kind == 'receivable':
             payments = sorted(self.payments, key=attrgetter('date', 'id'))
             mandates = Payment.get_sepa_mandates(payments)
-            Mandate.lock(list(filter(None, mandates)))
+            Mandate.lock(
+                [m for m in mandates if m and m.sequence_type == 'FRST'])
             sequence_types = {}
             for payment, mandate in zip(payments, mandates):
                 if not mandate: