bug: frappe.exceptions.CannotChangeConstantError: Value cannot be changed for Valuation Method

[nameduser0]

Description of the issue

For some Template Items when changing the default warehouse the below error is given when the Valuation Method is not shown and has not been changed

Context information (for bug reports)

Output of bench version

13.6

Stacktrace / full error message

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/data_import_legacy/importer.py", line 404, in upload
    original.save()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 285, in save
    return self._save(*args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 337, in _save
    self.run_post_save_methods()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 994, in run_post_save_methods
    self.run_method("on_update")
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 859, in run_method
    out = Document.hook(fn)(self, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 1148, in composer
    return composed(self, method, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 1131, in runner
    add_to_return_value(self, fn(self, *args, **kwargs))
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 853, in <lambda>
    fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py", line 136, in on_update
    self.update_variants()
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py", line 804, in update_variants
    update_variants(variants, self, publish_progress=False)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py", line 1301, in update_variants
    variant.save()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 285, in save
    return self._save(*args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 323, in _save
    self._validate()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 517, in _validate
    self.validate_set_only_once()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 563, in validate_set_only_once
    frappe.CannotChangeConstantError)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 432, in throw
    msgprint(msg, raise_exception=exc, title=title, indicator='red', is_minimizable=is_minimizable, wide=wide, as_list=as_list)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 411, in msgprint
    _raise_exception()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 365, in _raise_exception
    raise raise_exception(msg)
frappe.exceptions.CannotChangeConstantError: Value cannot be changed for Valuation Method