Updates to part revision support (#11670)

* Update revision validation

* Refactor UI display

* Fix for usePartFields

* Rearrange part settings

* Better visuals

* Update docs

* use 'full_name' field

* Update playwright tests

* Adjust unit test

* Fix playwright tests

src/backend/InvenTree/part/models.py

@@ -776,18 +776,12 @@ class Part(
                     'revision_of': _('Part cannot be a revision of itself')
                 })
 
-            # Part cannot be a revision of a part which is itself a revision
-            if self.revision_of.revision_of:
-                raise ValidationError({
-                    'revision_of': _(
-                        'Cannot make a revision of a part which is already a revision'
-                    )
-                })
-
             # If this part is a revision, it must have a revision code
             if not self.revision:
                 raise ValidationError({
-                    'revision': _('Revision code must be specified')
+                    'revision': _(
+                        'Revision code must be specified for a part marked as a revision'
+                    )
                 })
 
             if get_global_setting('PART_REVISION_ASSEMBLY_ONLY'):

src/backend/InvenTree/part/test_part.py

@@ -412,15 +412,11 @@ class PartTest(TestCase):
             name='Master Part', description='Master part (revision B)'
         )
 
-        with self.assertRaises(ValidationError) as exc:
-            rev_b.revision_of = rev_a
-            rev_b.revision = 'B'
-            rev_b.save()
-
-        self.assertIn(
-            'Cannot make a revision of a part which is already a revision',
-            str(exc.exception),
-        )
+        # Ensure we can make a revision of a revision
+        rev_b.revision_of = rev_a
+        rev_b.variant_of = template
+        rev_b.revision = 'B'
+        rev_b.save()
 
         rev_b.variant_of = template
         rev_b.revision_of = part