diff --git a/addons/delivery/models/product_packaging.py b/addons/delivery/models/product_packaging.py
index 939a6dd0bdfb0580a2c432f63a15cb57733c6e88..c5dffafaa6a4752bd79396e45168c5f8a635fb31 100644
--- a/addons/delivery/models/product_packaging.py
+++ b/addons/delivery/models/product_packaging.py
@@ -9,6 +9,7 @@ class ProductPackaging(models.Model):
 
 
     def _get_default_length_uom(self):
+        # TODO master delete
         return self.env['product.template']._get_length_uom_name_from_ir_config_parameter()
 
     def _get_default_weight_uom(self):
@@ -21,7 +22,7 @@ class ProductPackaging(models.Model):
     shipper_package_code = fields.Char('Package Code')
     package_carrier_type = fields.Selection([('none', 'No carrier integration')], string='Carrier', default='none')
     weight_uom_name = fields.Char(string='Weight unit of measure label', compute='_compute_weight_uom_name', default=_get_default_weight_uom)
-    length_uom_name = fields.Char(string='Length unit of measure label', compute='_compute_length_uom_name', default=_get_default_length_uom)
+    length_uom_name = fields.Char(string='Length unit of measure label', compute='_compute_length_uom_name')
 
     _sql_constraints = [
         ('positive_height', 'CHECK(height>=0)', 'Height must be positive'),
@@ -40,8 +41,12 @@ class ProductPackaging(models.Model):
 
 
     def _compute_length_uom_name(self):
-        for packaging in self:
-            packaging.length_uom_name = self.env['product.template']._get_length_uom_name_from_ir_config_parameter()
+        # FIXME This variable does not impact any logic, it is only used for the packaging display on the form view.
+        #  However, it generates some confusion for the users since this UoM will be ignored when sending the requests
+        #  to the carrier server: the dimensions will be expressed with another UoM and there won't be any conversion.
+        #  For instance, with Fedex, the UoM used with the package dimensions will depend on the UoM of
+        #  `fedex_weight_unit`. With UPS, we will use the UoM defined on `ups_package_dimension_unit`
+        self.length_uom_name = ""
 
     def _compute_weight_uom_name(self):
         for packaging in self: