Three related problems with Drop Shipping with Anglo Saxon Accounting.

One has been broken since #20080.

Another is caused by the same code.

The third - a fix from #12687 - is being bypassed by current code.



Impacted versions:

11.0, and 10.0 for at least some of this

Steps to reproduce:

Set up a product with
- real time valuation
- standard price
- Anglo Saxon accounting
- drop shipping turned on
- invoicing on delivered quantities

Create a product with a standard price of $40.

Current behavior:

_If I create a sales order and choose to ship from existing stock, then the invoice created after delivery is correct, and it has the correct Anglo Saxon account moves._

- Dr COGS $40
- Cr Output $40

If I create a sales order and choose to drop ship, I can then go to the RFQ, and change the RFQ price to $45, then receive the product, and generate the Vendor Bill.  Everything is correct at this point.  When I go back to the Sales Order and create and validate the invoice, it has the incorrect Anglo Saxon account moves:

- Dr Output $45
- Cr COGS $45

Expected behavior:

The accounting should be the same on the invoice.  The value is wrong, and the debits and credits are reversed.

Also, there should be an additional journal:

- Dr Output $40
- Cr Input $40

Th 3 problems are:

1. It is getting a -ve price unit from _compute_average_price because the stock move is not an outgoing move, but a supplier -> customer move!
2. It is getting the average price from those moves and using it, even if the product is using standard price.
3. The extra move that #12687 created is no longer being generated as the account moves are being bypassed entirely for dropshipping.  Somewhere in the process, we need to move the value from stock_input to stock_output.  This may be a v11 problem only.

Video/Screenshot link (optional):


else:
                    qty_taken_on_candidate = qty_to_take_on_candidates
                value_taken_on_candidate = qty_taken_on_candidate * candidate.price_unit
                candidate_vals = {
                    'remaining_qty': candidate.remaining_qty - qty_taken_on_candidate,
                    'remaining_value': candidate.remaining_value - value_taken_on_candidate,
                }
                candidate.write(candidate_vals)
                qty_to_take_on_candidates -= qty_taken_on_candidate
                tmp_value += value_taken_on_candidate
                if qty_to_take_on_candidates == 0:
                    break
            remaining_value_before_vacuum = move.remaining_value
            
            
            new_remaining_qty = -qty_to_take_on_candidates
            new_remaining_value = 0 if not new_remaining_qty else move.remaining_value + tmp_value
            move.write({
                'remaining_value': new_remaining_value,
                'remaining_qty': new_remaining_qty,
            })
            if move.product_id.valuation == 'real_time':
                
                
                
                
                
                corrected_value = tmp_value
                if remaining_value_before_vacuum < 0:
                    corrected_value += remaining_value_before_vacuum