Hi,

there are already some topics in the forum dealing with this - and as it seems it is not fixed yet. We did encountered the same problem here - on a odoo self hosted zap with a datetime value we do get

object of type 'DateTime' has no len()

Part of the payload which is problematic is this one (i think so)

<member>
<name>legal_basis_calculated</name>
<value><dateTime.iso8601>20220914T08:10:06</dateTime.iso8601></value>
</member>

It seems that a change in the python xmlrpc lib has caused this, because we get this value in the function to_datetime (on odoo side):

Got value: 20220914T08:24:05 of type: <class 'xmlrpc.client.DateTime'> 

And this function does not work with such an object type

You can work around on odoo side with this monkey patch

import xmlrpc.client
from odoo.fields import Datetime
from datetime import date, datetime, time
from odoo.tools import DEFAULT_SERVER_DATETIME_FORMAT as DATETIME_FORMAT

@staticmethod
def to_datetime(value):
    """Convert an ORM ``value`` into a :class:`datetime` value.

    :param value: value to convert.
    :type value: str or date or datetime
    :return: an object representing ``value``.
    :rtype: datetime or None
    """
    if not value:
        return None
    if isinstance(value, date):
        if isinstance(value, datetime):
            if value.tzinfo:
                raise ValueError("Datetime field expects a naive datetime: %s" % value)
            return value
        return datetime.combine(value, time.min)
    # Check for type xmlrpc.client.DateTime - and convert to python datetime
    if isinstance(value, xmlrpc.client.DateTime):
        return datetime.strptime(str(value), '%Y%m%dT%H:%M:%S')
    # TODO: fix data files
    return datetime.strptime(value, DATETIME_FORMATE:len(value) - 2])


# Monkey patch this one
Datetime.to_datetime = to_datetime