Bank statement import: 'Fault: conversion from NoneType to Decimal is not supported'

Support System Administrator
1

Hello everybody,
my productive Tryton is running locally in a VENV, still at Tryton version v7.0. Basic system is ubuntu, which I recently upgraded from v24 to v26; with this came upgrades

* postgres 16 → 18
* python 3.12 → 3.14

I re-created a new VENV. As system-wide pip install is no longer supported, I installed python libraries by using apt.

Tryton is working, but when I try to import a CAMT052 bank statement, I get this error message:

Fault: conversion from NoneType to Decimal is not supported

My guess is that I’m still missing a python library, but could not find it by comparing install lists. Any hint will be appreciated.

EG

2

The series 7.0 does not support Python 3.14, the highest version supported is Python 3.12.

3

Python 3.14 is supported by Tryton 8.0 series, so the saffer path is to upgrade also your trytond version to 8.0 series.

4

But it is probably not a dependency issue but it is hard to say without the full traceback.