[FIX] account: correct tag inversion for lines of invoices with tags, but no tax

This use case can happen in case an invoice is imported without recreating all the taxes, only keeping the VAT information.

closes odoo/odoo#64638

X-original-commit: 7ad61842c703ceb031b2f917ad8bbc26d7d0b780
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

addons/account/models/account_move.py

@@ -3604,9 +3604,9 @@ class AccountMoveLine(models.Model):
     @api.depends('move_id.move_type', 'tax_ids', 'tax_repartition_line_id')
     def _compute_tax_tag_invert(self):
         for record in self:
-            if not record.tax_repartition_line_id and not record.tax_ids:
-                # We only want to set this field to True on lines using taxes
-                record.tax_tag_invert = False
+            if not record.tax_repartition_line_id and not record.tax_ids :
+                # Invoices imported from other softwares might only have kept the tags, not the taxes.
+                record.tax_tag_invert = record.tax_tag_ids and record.moved_id.is_inbound()
 
             elif record.move_id.move_type == 'entry':
                 # For misc operations, cash basis entries and write-offs from the bank reconciliation widget
@@ -3621,7 +3621,7 @@ class AccountMoveLine(models.Model):
                 record.tax_tag_invert = (tax_type == 'purchase' and is_refund) or (tax_type == 'sale' and not is_refund)
 
             else:
-                # For invoices
+                # For invoices with taxes
                 record.tax_tag_invert = record.move_id.is_inbound()
 
     @api.depends('tax_tag_ids', 'debit', 'credit', 'journal_id', 'tax_tag_invert')