[FIX] account: do not override accounting date for vendor bills

The accounting date must be today by default and changing the bill date
must not affect that.

Kind of followup after this change of behavior fcaa54939e9a4f0dd5e47cd0ccffe7aa24bd451c

task-2550985

closes odoo/odoo#71977

X-original-commit: c63af09774414a004ef34644b4f38b4fdb1d12bd
Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>
Signed-off-by: William André (wan) <wan@odoo.com>

addons/account/models/account_move.py

@@ -381,9 +381,12 @@ class AccountMove(models.Model):
         if self.invoice_date:
             if not self.invoice_payment_term_id and (not self.invoice_date_due or self.invoice_date_due < self.invoice_date):
                 self.invoice_date_due = self.invoice_date
-            if self.date != self.invoice_date:  # Don't flag date as dirty if not needed
+            if (
+                self.is_sale_document() and self.date != self.invoice_date
+                or self.is_purchase_document() and not self.date
+            ):
                 self.date = self.invoice_date
-            self._onchange_currency()
+                self._onchange_currency()
 
     @api.onchange('journal_id')
     def _onchange_journal(self):

addons/account/tests/common.py

@@ -373,6 +373,7 @@ class AccountTestInvoicingCommon(TransactionCase):
                     .with_company(company or cls.env.company) \
                     .with_context(default_move_type=move_type, account_predictive_bills_disable_prediction=True))
         move_form.invoice_date = invoice_date or fields.Date.from_string('2019-01-01')
+        move_form.date = move_form.invoice_date
         move_form.partner_id = partner or cls.partner_a
 
         for product in (products or []):