[FIX] account: Fixes the losing of company_id in account move

Currently, the company_id of an account move is related to its journal.
This means that if you empty the journal field, the company_id is also
emptied.
This is then causing a traceback when adding a new line, for example.

This change will transform the related company_id in a computed field,
making sure to not lose the company_id if the journal_id is emptied.

task id #2392004

closes odoo/odoo#68886

X-original-commit: c3c6ec69a0c50daf0b33df62144b6cd2f254a4f5
Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>
Signed-off-by: William André (wan) <wan@odoo.com>
Signed-off-by: Nicolas Viseur <vin-odoo@users.noreply.github.com>

addons/account/models/account_move.py

@@ -168,10 +168,11 @@ class AccountMove(models.Model):
         check_company=True, domain="[('id', 'in', suitable_journal_ids)]",
         default=_get_default_journal)
     suitable_journal_ids = fields.Many2many('account.journal', compute='_compute_suitable_journal_ids')
-    company_id = fields.Many2one(string='Company', store=True, readonly=True,
-        related='journal_id.company_id', change_default=True, default=lambda self: self.env.company)
+    company_id = fields.Many2one(comodel_name='res.company', string='Company',
+                                 store=True, readonly=True,
+                                 compute='_compute_company_id')
     company_currency_id = fields.Many2one(string='Company Currency', readonly=True,
-        related='journal_id.company_id.currency_id')
+        related='company_id.currency_id')
     currency_id = fields.Many2one('res.currency', store=True, readonly=True, tracking=True, required=True,
         states={'draft': [('readonly', False)]},
         string='Currency',
@@ -689,8 +690,8 @@ class AccountMove(models.Model):
 
             balance = currency._convert(
                 taxes_map_entry['amount'],
-                self.journal_id.company_id.currency_id,
-                self.journal_id.company_id,
+                self.company_currency_id,
+                self.company_id,
                 self.date or fields.Date.context_today(self),
             )
             to_write_on_line = {
@@ -1040,6 +1041,11 @@ class AccountMove(models.Model):
                 if invoice != invoice._origin:
                     invoice.invoice_line_ids = invoice.line_ids.filtered(lambda line: not line.exclude_from_invoice_tab)
 
+    @api.depends('journal_id')
+    def _compute_company_id(self):
+        for move in self:
+            move.company_id = move.journal_id.company_id or move.company_id or self.env.company
+
     def _get_lines_onchange_currency(self):
         # Override needed for COGS
         return self.line_ids