Currently, an error occurs when user tries to create a new amazon account on a new company.

Steps to replicate:
- Install `sale_amazon`.
- Create a new company and switch to it.
- Go to Settings > Amazon account > Try to Create a new account.

Error:
```
  File /home/odoo/odoo18/enterprise/sale_amazon/models/amazon_account.py, line 214, in create
    'location_id': parent_location_data[0]['view_location_id'][0],
IndexError: list index out of range
```

Cause:
- Whenever a new company is created, it doesnt have any warehouses [1] and amazon stock locations [2].
- This causes the `parent_location_data` to be an empty list and causes error at line [3].

Solution:
- Assigning the `location_id` if the `parent_location_data` exists.

[1]: https://github.com/odoo/enterprise/blob/23f085bdba333807a25a2d41214b25f474c7edf8/sale_amazon/models/amazon_account.py#L206-L210

[2]: https://github.com/odoo/enterprise/blob/23f085bdba333807a25a2d41214b25f474c7edf8/sale_amazon/models/amazon_account.py#L201-L204

[3]: https://github.com/odoo/enterprise/blob/23f085bdba333807a25a2d41214b25f474c7edf8/sale_amazon/models/amazon_account.py#L214

sentry-7086464738

Forward-Port-Of: odoo/enterprise#101465

Steps to reproduce
-----
- Enable batch pickings
- Create a product
- Create 2 receptions for the product (qty > 1)
- Create a batch with the 2 transfers
- Open the batch in barcode
- Scan part of both pickings
- Go back to the barcode main screen
- Open the batch again

> Both pickings have their demand = partially delivered quantity

Cause
-----
When leaving the page, we trigger

https://github.com/odoo/enterprise/blob/91d6a096e88e4f11d7504d7a4052a57e2cb09ca8/stock_barcode/models/stock_move.py#L65-L68

in which we end up merging the moves together

https://github.com/odoo/enterprise/blob/91d6a096e88e4f11d7504d7a4052a57e2cb09ca8/stock_barcode/models/stock_move.py#L51

This has been added by 9753c24 (ade0bef in 17.0)

The problem is that `_merge_moves` merges all of the moves into the first of `merge_into`

https://github.com/odoo/odoo/blob/26761e04bb648b46cd35697c6cbc8ed1e27fef90/addons/stock/models/stock_move.py#L1086-L1088

This, however, doesn't make much sense for batches because the moves can be from different pickings.

-----
Ticket:
opw-5163740

Forward-Port-Of: odoo/enterprise#101499
Forward-Port-Of: odoo/enterprise#100940

Step to reproduce:
- Install l10n_in_hr_payroll.
- Create 3-4 employee with labour welfare fund, all in different departments.
- Open the LWF report wizard and do not select any department.
- Download report , all employee will come in report.
- Now select any department and download report again.
- All employee(It is fetching previous data) + employee from selected
  department will come in report.

Cause:
- In '_compute_line_ids()' wizard computed field 'line_ids' doesn't properly
   reset previous lines as a result previous data remains in lines.
- When the department is changed, the wizard id remain same,
  so previously lines added to wizard are coming with new lines.
- Using `Command.link()` for new lines is invalid because it requires an
  existing database record ID, but wizard lines are creating inside a compute
  method so their IDs are only saved after the flush.

Fix:
- Since this is a stable version, clear the previously existing lines using
  'Command.clear()' before creating new ones.

Task - 5366498

#### [FIX] snailmail_account_followup: fix address, cover page and layout

Currently there is the following potential problem when sending
the followup report via snailmail.
1. The address generation is not adjusted for snailmail. That can
   lead to problems with the service we use to send the actual letter.
   They validate the address rather strictly.
2. The cover page option does not work; it does not add a cover page.
   So we can not work around problems with the address generation
   by adding a cover page.
3. The layout / dimensions / margins of the generated document / PDF may not work
   with our current snailmail provider (Pingen). But there is no error
   message about it. (Although we do have something in the usual
   snailmail flow)
4. In case the address is invalid we do not try to "print" / send the letter,
   so the user does not receive any feedback.
   This could be an issue in case multiple follow-up reports are sent
   at the same time.

This commit fixes these issues. (See below for details.)

(1)
The logic for this already exists but it is only activated when
a context key is set. This is not the case currently.
After this commit we do set the key.

(2) & (3)
The issue is that we generate the PDF attachment before creating the
'snailmail.letter' record.
In the usual snailmail flow the PDF attachment generation is handled during the sending and
printing (in function `_fetch_attachment` on model 'snailmail.letter').
There is some special logic to
- add a cover page to the report PDF (if the option is selected)
- make sure the page dimensions of the PDF are okay
- overwrite the margins of the PDF with white to make sure the PDF is
  not rejected by Pingen because of this

But all this only happens if we do not have an attachment already.
(So it does not happen currently with the followup report)
For this a function called `_generate_report_pdf` was extracted from `_fetch_attachment`
in the related community commit to generate the report PDF (and its
filename). The function is extended here to be able to generate the
followup report.

(4)
We try to print / send the letter even if the address is invalid

Reproduce (i.e. for the cover page issue; but it explains how to get
the PDF that will be sent in general)

1. Install `snailmail_account_followup`
2. Create an overdue invoice
3. Set the "Add a Cover Page" option
   (Settings -> Accounting -> section "Customer Invoices")
   - enabled to test for the cover page
   - disabled to test that the address generation is adjusted
4. Send a follow-up report:
   - On 17.0: Accounting -> menu: "Customers" /  "Follow-up Reports"
     -> click on a line / partner -> button "Follow up"
   - On 18.0+: partner form view -> tab "Accounting"
     -> section "invoice follow-ups" -> button "Send"
5. Go to the snailmail letter:
   In debug mode: Settings -> menu: "Technical" -> section: "Email" -> "Snailmail Letters"
   (or just search for "snailmail" in the main screen)
   And select the letter
6. Download the PDF document

#### [FIX] snailmail_account_followup: forbid regenerating failed letters

The wizard to resend failed letters which allows to change the
cover page option is broken: The follow-up report can not be regenerated
correctly because it requires special follow-up specific `options` that are
lost after the initial pdf generation for the letter.

Currently it can happen that the follow-up PDF is regenerated but
without (actual) content (table listing the overdue amounts).

After this commit we cancel the snailmail letters and show an
error notification indicating that the followup needs to be done again to
create a new letter.

Reproduce
(needs credit on IAP or locally edit this function https://github.com/odoo/odoo/blob/3ffd51f1cb18e3f4fb0367c4a498d7438e0c0357/addons/snailmail/static/src/core_ui/message_patch.js#L11
to open the resend wizard `this.openFormatLetterAction()` for `sn_credit` error or always)

1. Install `snailmail_account_followup`
2. Create an overdue invoice
3. Ensure the address of the partner causes issues with Pingen
4. Ensure the cover page option is disabled:
   Settings -> Accounting -> section "Customer Invoices"
5. Send a follow-up report:
   - On 17.0: Accounting -> menu: "Customers" /  "Follow-up Reports"
     -> click on a line / partner -> button "Follow up"
   - On 18.0+: partner form view -> tab "Accounting"
     -> section "invoice follow-ups" -> button "Send"
6. Make some modifications like editing the follow-up message or a custom attachment
7. Download the snailmail letter PDF (see previous commit for details)
8. In the chatter go to the message saying "Letter sent by post with Snailmai"
9. Click on the red symbol (paper plane) next to the name
10. A "Format Error" wizard should show up
11. Select "Add a Cover Page"
12. Click the button "Update Config and Re-Send"
13. Download the snailmail letter PDF (see previous commit for details)
14. Compare PDFs from 7 and 13; they are different (not just the cover page)

#### references

opw-5160121
opw-5209504
opw-5226366

Forward-Port-Of: odoo/enterprise#101498
Forward-Port-Of: odoo/enterprise#99491

### Steps to reproduce:

- In the settings enable By-Products an Multi-step routes
- Put your warehouse in manufacturing in 3 steps
- Create two storable products:
    - Final Product (FP) with an empty bom
    - By Product (BP)
- Go to the barcode app > Operations > Manufacturing > New
- Scan FP > Register By-Products
- Scan BP
#### > The line is created with pre-prod as location and prod as destination

### Cause of the issue:

Since no existing line refers to the by product, a new line is created and its `location_id` and `location_dest_id` are provided by the `_getNewLineDefaultValues`:
https://github.com/odoo/enterprise/blob/17fd46b04d87585b7ed46c00d9559414daa17384/stock_barcode/static/src/models/barcode_model.js#L562-L566 However, at this point nothing had set the `params.newByProduct` in the `processBarcode`:
https://github.com/odoo/enterprise/blob/17fd46b04d87585b7ed46c00d9559414daa17384/stock_barcode_mrp/static/src/models/barcode_mrp_model.js#L375-L383 In fact, the only thing indicating that we are creating a by prodcut line at this point is the `displayByProduct`.

### Note:

The issue is no longer reproducible in 18.0+ as this change has already been applied in 2d5dbb93e6b33c2be786f9b2361c993f715d1a7f

opw-5350222

Forward-Port-Of: odoo/enterprise#101135
Forward-Port-Of: odoo/enterprise#101087

Steps to reproduce:
- Enable Rental pickings
- Create a rental for a product, for 4 quantity
- Process the delivery
- Open the barcode app and open the reception
- Scan the product once and validate

Issue:
The receipt is validated without issues nor warning, despite being incomplete.

This is due to a bad mix of two changes:
- #60801, which always sets the rental receipt as return of the delivery
- #48788, which removes the backorder check for returns in barcode

For regular returns made in barcode, it makes sense to avoid the backorder check, as from here we're processing a full picking return and we'd have the confirmation pop every time.

However, things are different for rental receipts, as despite them being set as returns of the delivery, they're proper receipts that need to handle the partial receipt.

To avoid the issue, rather than removing the backorder check whenever there's a return linked to the picking, now also checks that there isn't a rental order linked to the picking.

opw-5265874

Forward-Port-Of: odoo/enterprise#101387