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):


if new_standard_price and move.product_id.cost_method == 'fifo':
            move.product_id.standard_price = new_standard_price
        
        
        
        if qty_to_take_on_candidates == 0:
            move.write({
                'value': -tmp_value if not quantity else move.value or -tmp_value,  
                'price_unit': -tmp_value / move.product_qty,
            })
        elif qty_to_take_on_candidates > 0:
            last_fifo_price = new_standard_price or move.product_id.standard_price
            negative_stock_value = last_fifo_price * -qty_to_take_on_candidates
            vals = {
                'remaining_qty': move.remaining_qty + -qty_to_take_on_candidates,
                'remaining_value': move.remaining_value + negative_stock_value,
                'value': -tmp_value + negative_stock_value,
                'price_unit': (-tmp_value + negative_stock_value) / (move.product_qty or quantity),
            }
            move.write(vals)
        return tmp_value
    def _run_valuation(self, quantity=None):
        self.ensure_one()
        if self._is_in():
            valued_move_lines = self.move_line_ids.filtered(lambda ml: not ml.location_id._should_be_valued() and ml.location_dest_id._should_be_valued() and not ml.owner_id)
            valued_quantity = 0
            for valued_move_line in valued_move_lines:
                valued_quantity += valued_move_line.product_uom_id._compute_quantity(valued_move_line.qty_done, self.product_id.uom_id)