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):


""" This method returns a boolean reflecting whether the products stored in `self` should
        be considered when valuating the stock of a company.
        """
        self.ensure_one()
        if self.usage == 'internal' or (self.usage == 'transit' and self.company_id):
            return True
        return False
class StockMoveLine(models.Model):
    _inherit = 'stock.move.line'
    @api.model
    def create(self, vals):
        res = super(StockMoveLine, self).create(vals)
        move = res.move_id
        if move.state == 'done':
            correction_value = move._run_valuation(res.qty_done)
            if move.product_id.valuation == 'real_time' and (move._is_in() or move._is_out()):
                move.with_context(force_valuation_amount=correction_value)._account_entry_move()
        return res
    
    @api.multi
    def write(self, vals):
        if 'qty_done' in vals:
            
            
            moves_to_update = {}
            for move_line in self.filtered(lambda ml: ml.state == 'done' and (ml.move_id._is_in() or ml.move_id._is_out())):