Thanks for reply, 

I dont have custom code. I find that in the database : 

--
-- Data for Name: account_payment_method; Type: TABLE DATA; Schema: public; Owner: -
--

COPY public.account_payment_method (id, create_uid, write_uid, code, payment_type, name, create_date, write_date) FROM stdin;
1	1	1	manual	inbound		​	​{"en_US": "Manual", "fr_FR": "Manuel"}	2024-03-17 03:08:19.908659	2024-03-17 03:08:19.908659
2	1	1	manual	outbound		​{"en_US": "Manual", "fr_FR": "Manuel"}	2024-03-17 03:08:19.908659	2024-03-17 03:08:19.908659
\.

--
-- Data for Name: account_payment_method_line; Type: TABLE DATA; Schema: public; Owner: -
--

COPY public.account_payment_method_line (id, sequence, payment_method_id, payment_account_id, journal_id, create_uid, write_uid, name, create_date, write_date, payment_provider_id) FROM stdin;
1	10	1	\N	6	1	1	Manual	2024-03-17 03:08:36.43771	2024-03-17 03:08:36.43771	\N
2	10	1	\N	7	1	1	Manual	2024-03-17 03:08:36.43771	2024-03-17 03:08:36.43771	\N
3	10	2	\N	6	1	1	Manual	2024-03-17 03:08:36.43771	2024-03-17 03:08:36.43771	\N
4	10	2	\N	7	1	1	Manual	2024-03-17 03:08:36.43771	2024-03-17 03:08:36.43771	\N
5	10	1	\N	6	2	2	Manuel	2024-03-19 04:10:16.902555	2024-03-19 04:10:16.902555	\N
\.

I think the probme is here, but idk where...

Hi,
You have to check your db and see along with your custom codes to understands what exactly going on. 

The above message is raised when multiple records in account.payment.method with same name, journal and payment type is created.

Thanks