Update following the addition of standard invoice template

--HG-- branch : 16.0

• Odoo ticket:
• Mint PR...

models/redner_substitution.py

@@ -24,6 +24,7 @@
 from odoo.addons import converter
 
 from ..converter import ImageDataURL, ImageFile
+from ..utils.sorting import find_field_with_sort_order, sortkey
 
 
 class Substitution(models.Model):
@@ -99,4 +100,7 @@
             elif sub.converter == "image-data-url":
                 conv = ImageDataURL(sub.value)
             elif sub.converter == "relation-to-many":
+                # Unpack the result of finding a field with its sort order into
+                # variable names.
+                value, sorted = find_field_with_sort_order(sub.value)
                 conv = converter.RelationToMany(
@@ -102,3 +106,3 @@
                 conv = converter.RelationToMany(
-                    sub.value,
+                    value,
                     None,
@@ -104,4 +108,5 @@
                     None,
+                    sortkey=sortkey(sorted) if sorted else None,
                     converter=sub.get_children().build_converter(),
                 )
             elif sub.converter == "relation-path":