Restore V12 from V11 Backups V12 patch Item Tax to item tax template issue

1

Trying to upgrade from V11 to 12.
Have tried various methods so far.
I have got over loads of issues but now stuck on this one while using 2 different methods.
Upgrading from working V11 database.
I think it is something to do with item valuation method
Executing erpnext.patches.v12_0.move_item_tax_to_item_tax_template in site1.local (_1bd3e0294da19198)
Traceback (most recent call last):
File “/usr/lib/python3.6/runpy.py”, line 193, in _run_module_as_main
“main”, mod_spec)
File “/usr/lib/python3.6/runpy.py”, line 85, in _run_code
exec(code, run_globals)
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 97, in
main()
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 764, in call
return self.main(*args, **kwargs)
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 717, in main
rv = self.invoke(ctx)
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 555, in invoke
return callback(*args, **kwargs)
File “/home/frappe/frappe-bench/env/lib/python3.6/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/init.py”, line 25, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/site.py”, line 233, in migrate
migrate(context.verbose, rebuild_website=rebuild_website, skip_failing=skip_failing)
File “/home/frappe/frappe-bench/apps/frappe/frappe/migrate.py”, line 48, in migrate
frappe.modules.patch_handler.run_all(skip_failing)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 41, in run_all
run_patch(patch)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 30, in run_patch
if not run_single(patchmodule = patch):
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 71, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 91, in execute_patch
frappe.get_attr(patchmodule.split()[0] + “.execute”)()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/patches/v12_0/move_item_tax_to_item_tax_template.py”, line 44, in execute
item.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 271, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 324, in _save
self.run_post_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 917, in run_post_save_methods
self.run_method(“on_update”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 786, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1056, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1039, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 780, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py”, line 139, in on_update
self.update_variants()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py”, line 764, in update_variants
update_variants(variants, self, publish_progress=False)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py”, line 1119, in update_variants
variant.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 271, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 310, in _save
self._validate()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 479, in _validate
self.validate_set_only_once()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 507, in validate_set_only_once
frappe.CannotChangeConstantError)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 360, in throw
msgprint(msg, raise_exception=exc, title=title, indicator=‘red’)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 346, in msgprint
_raise_exception()
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 315, in _raise_exception
raise raise_exception(msg)
frappe.exceptions.CannotChangeConstantError: Value cannot be changed for Valuation Method
frappe@VM4:~/frappe-bench$

Any help or ideas would be appreciated.

2

I also had painful experiences. The one that worked for me

I did the following prior :

  • Installed version 12 as suggested on the installation instructions
  • Copied data and files using “bench backup” from my current version 11 server
  • Restored the database and files using “bench restore” on my new installation
  • Start bench
  • Ran “bench migrate” on my new installation in a new window
3

Yes I did very similar.
I installed a working version of 12 then force restored the backup of V11 then bench migrate.
went ok till this patch, then it stalled.
I think must have a conflict in item valuation method in my existing database. but cant think how to repair it.
However it not causing the current database to fail in V11.

Any ideas?

4

If you search this site for “.move_item_tax_to_item_tax_template” , there seems to be a lot of users with similar problem, and a github issue has been opened.

5

Thanks @smino I am looking now. I did search on Google for info but I did not search Github. Surprised this info did not show up first time.
The Github issues do not seem to be exactly the same. However they all look very stubborn problems.
I am going to try and inspect my database and see if the valuation method got changed on any items in the early days when we first started playing with the software. We use FIFO.
I accept that some people have upgraded to V12 from 11 so I guess it must be possible.
Any other thoughts would be appreciated.