In this commit 004b56a5c31841bc0bf4a9f17902bbff8d0f509d we added the `l10n_fr_pdp.what_is_pdp` action as PDP version of the `account_peppol.what_is_peppol` action.

But one case does not work / was not tested properly: We are registered on PDP already.
In that case we just want to go back to the "move send" wizard. But the `what_is_pdp` action does not support that currently. So there is a traceback.

Steps to reproduce:
1. Install `l10n_fr_pdp`
2. Activate French E-Invoicing / PDP in Demo mode
3. Create and post an invoice for a French PDP partner (e.g. just use the "FR Company")
4. Click "Send"
5. In the "move send" wizard disable the "French E-Invoicing (Demo)" option
6. Click on "Why should you use it?" in the warning
7. Click "Got it" in the window that pops up.
8. Traceback (see below)

```
Traceback (most recent call last):
  File "/home/odoo/src/odoo/odoo/http.py", line 2167, in _transactioning
    return service_model.retrying(func, env=self.env)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/odoo/service/model.py", line 157, in retrying
    result = func()
             ^^^^^^
  File "/home/odoo/src/odoo/odoo/http.py", line 2134, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/odoo/http.py", line 2382, in dispatch
    result = self.request.registry['ir.http']._dispatch(endpoint)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/odoo/addons/base/models/ir_http.py", line 333, in _dispatch
    result = endpoint(**request.params)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/odoo/http.py", line 754, in route_wrapper
    result = endpoint(self, *args, **params_ok)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/addons/web/controllers/dataset.py", line 36, in call_kw
    return call_kw(request.env[model], method, args, kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/odoo/api.py", line 535, in call_kw
    result = getattr(recs, name)(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/addons/account_peppol/models/res_config_settings.py", line 159, in button_peppol_reregister
    self.ensure_one()
  File "/home/odoo/src/odoo/odoo/models.py", line 6277, in ensure_one
    raise ValueError("Expected singleton: %s" % self)
ValueError: Expected singleton: res.config.settings()
```

task-None


Thanks to KYMAG for finding / reporting the issue.

Forward-Port-Of: odoo/odoo#282406

Deleting a draft customer invoice linked to timesheets resets their timesheet_invoice_id so the hours become invoiceable again. This write also marks the timesheets' so_line for recompute, and the re-derivation runs while the lines are no longer protected by the invoice link. When the task or project no longer resolves to a sale order item (e.g. it was unlinked after invoicing), the timesheets lose their sale order item or get reassigned to another one, so the delivered hours silently disappear from the original order line.

Protect so_line during the write and drop the pending recompute: deleting an invoice must only make the hours invoiceable again, not change their allocation.

Steps to reproduce:
- Install Sales and Timesheets
- Create a service product with invoice policy "Based on Timesheets" and "Create a task in a new project"
- Create and confirm a sale order with this product
- Log a timesheet on the generated task
- Create the invoice (keep it in draft)
- Remove the Sales Order Item from the task and from the project settings (or point them to a sale order item of another order)
- Delete the draft invoice
- Open the timesheet: its Sales Order Item is emptied (or replaced by the other order's item, whose delivered quantity now includes the hours sold on the original order), and the original line's delivered quantity is reset

---
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: odoo/odoo#280154
Forward-Port-Of: odoo/odoo#279552