[16.0][FIX] product_packaging_level: Preserve sequence order

product_packaging_level/models/product_packaging.py

@@ -8,8 +8,8 @@
 
 class ProductPackaging(models.Model):
     _inherit = "product.packaging"
-    _order = "product_id, level_sequence"
 
+    sequence = fields.Integer(compute="_compute_sequence", store=True)
     packaging_level_id = fields.Many2one(
         "product.packaging.level",
         required=True,
@@ -19,12 +19,6 @@ class ProductPackaging(models.Model):
     barcode_required_for_gtin = fields.Boolean(
         readonly=True, compute="_compute_barcode_required_for_gtin"
     )
-    level_sequence = fields.Integer(
-        string="Level Sequence",
-        related="packaging_level_id.sequence",
-        readonly=True,
-        store=True,
-    )
     qty_per_level = fields.Char(
         compute="_compute_qty_per_level", string="Qty per package level"
     )
@@ -61,6 +55,11 @@ def _check_one_packaging_level_per_product(self):
                     ).format(product.display_name)
                 )
 
+    @api.depends("packaging_level_id")
+    def _compute_sequence(self):
+        for packaging in self:
+            packaging.sequence = packaging.packaging_level_id.sequence
+
     @api.depends("packaging_level_id", "packaging_level_id.has_gtin", "qty")
     def _compute_barcode_required_for_gtin(self):
         for packaging in self: