I am facing an issue while trying to define an action server in Odoo14. The objective is to call a Python method that returns a window action because I need to access fields in the current model and pass them to the context. Unfortunately, directly using a window action with a context that calls fields doesn't seem to be working as expected. Below is the code snippet I am using:

XML Code: 

<odoo>
<record id="action_add_supplier_payment_bank_statement_line_new" model="ir.actions.server">
    <field name="name">Créer un paiement</field>
    <field name="model_id" ref="account.model_account_bank_statement_line"/>
    <field name="binding_model_id" ref="account.model_account_bank_statement_line"/>
    <field name="state">code</field>
    <field name="binding_view_types">list</field>
    <field name="code">action = model.action_payment_bank_statement_line()</field>
</record>
</odoo>

Python Method:

def action_payment_bank_statement_line(self):
        action_ref = 'account.view_account_payment_form'
        print(action_ref)
        action = self.env['ir.actions.act_window']._for_xml_id(action_ref)
        action['context'] = {
            'default_payment_type': 'outbound',
            'default_partner_type': 'customer',
            'default_ref': self.payment_ref,
            'default_amount': self.amount,
            'default_date': datetime.strptime(self.date, '%Y-%m-%d')
        }
        action['view_mode'] = 'form'
        action['target'] = 'new'
        return action

However, I'm encountering the following error when I click on action button:

result = request.dispatch()
  File "/opt/odoo14/odoo/odoo/http.py", line 696, in dispatch
    result = self._call_function(**self.params)
  File "/opt/odoo14/odoo/odoo/http.py", line 370, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/odoo14/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/odoo14/odoo/odoo/http.py", line 358, in checked_call
    result = self.endpoint(*a, **kw)
  File "/opt/odoo14/odoo/odoo/http.py", line 919, in __call__
    return self.method(*args, **kw)
  File "/opt/odoo14/odoo/odoo/http.py", line 544, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo14/odoo/addons/web/controllers/main.py", line 1728, in run
    result = action.run()
  File "/opt/odoo14/odoo/odoo/addons/base/models/ir_actions.py", line 632, in run
    res = runner(run_self, eval_context=eval_context)
  File "/opt/odoo14/odoo/addons/website/models/ir_actions.py", line 61, in _run_action_code_multi
    res = super(ServerAction, self)._run_action_code_multi(eval_context)
  File "/opt/odoo14/odoo/odoo/addons/base/models/ir_actions.py", line 501, in _run_action_code_multi
    safe_eval(self.code.strip(), eval_context, mode="exec", nocopy=True)  # nocopy allows to return 'action'
  File "/opt/odoo14/odoo/odoo/tools/safe_eval.py", line 347, in safe_eval
    raise ValueError('%s: "%s" while evaluating\n%r' % (ustr(type(e)), ustr(e), expr))
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/odoo14/odoo/odoo/http.py", line 652, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/opt/odoo14/odoo/odoo/http.py", line 317, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: : "" while evaluating
'action = record.action_payment_bank_statement_line()'

I would appreciate any assistance in identifying and correcting the issue in the code, or any alternative suggestions for defining the action server correctly.