[FIX] account: partner_id field in account.move

From 94ed4ce8c8

The original issue is the following:
- Go to the journal item creation
- Choose a partner
- Add a line => the partner on the journal item is removed

This is because `partner_id` on the account move is a related to
`partner_id` on the account move lines. This is likely to cause errors
during the manual encoding of a journal item, since the relation will
link the partner of the account move to the partner of the first account
move line only.

opw:672354

addons/account/models/account_move.py

@@ -85,7 +85,7 @@ class AccountMove(models.Model):
            'in \'Posted\' status.')
     line_ids = fields.One2many('account.move.line', 'move_id', string='Journal Items',
         states={'posted': [('readonly', True)]}, copy=True)
-    partner_id = fields.Many2one('res.partner', related='line_ids.partner_id', string="Partner", store=True, states={'posted': [('readonly', True)]})
+    partner_id = fields.Many2one('res.partner', related='line_ids.partner_id', string="Partner", store=True, readonly=True)
     amount = fields.Monetary(compute='_amount_compute', store=True)
     narration = fields.Text(string='Internal Note')
     company_id = fields.Many2one('res.company', related='journal_id.company_id', string='Company', store=True, readonly=True,

addons/account/views/account_view.xml

@@ -1262,6 +1262,7 @@
                             <field name="line_ids" widget="one2many_list"
                               context="{'line_ids': line_ids, 'journal_id': journal_id }">
                                 <tree editable="bottom" string="Journal Items">
+                                    <field name="partner_id" domain="['|', ('parent_id', '=', False), ('is_company', '=', True)]"/>
                                     <field name="account_id" domain="[('company_id', '=', parent.company_id), ('deprecated', '=', False)]"/>
                                     <field name="name"/>
                                     <field name="analytic_account_id" groups="analytic.group_analytic_accounting" domain="[('account_type', '=', 'normal')]"/>