# Error in quality module
**URL:** https://discuss.tryton.org/t/error-in-quality-module/8088
**Category:** Developer
**Tags:** quality
**Created:** [December 4, 2024, 9:01am UTC](https://discuss.tryton.org/t/error-in-quality-module/8088 "2024-12-04T09:01:39Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [December 4, 2024, 9:01am UTC](https://discuss.tryton.org/t/error-in-quality-module/8088/1 "2024-12-04T09:01:39Z")
When you create an Inspection, define a control, add a point in the inspection with a correct value, and then try to change the control, that error is thrown:
```auto
Traceback (most recent call last):
File "usrlocallibpython3.11dist-packagestrytondwsgi.py", line 109, in dispatch_request
return endpoint(request, **request.view_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondprotocolsdispatcher.py", line 43, in rpc
return methods.get(request.rpc_method, _dispatch)(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondwsgi.py", line 75, in wrapper
return func(request, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondprotocolswrappers.py", line 200, in wrapper
return func(request, pool, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondprotocolsdispatcher.py", line 201, in _dispatch
result = rpc.result(meth(inst, *c_args, **c_kwargs))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondmodelmodelview.py", line 51, in wrapper
result = func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondmodelfieldsfield.py", line 124, in wrapper
return func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "usrlocallibpython3.11dist-packagestrytondmodulesqualityquality.py", line 442, in on_change_control
self.points.update(
File "usrlocallibpython3.11dist-packagestrytondtoolsimmutabledict.py", line 11, in _not_allowed
raise TypeError("Operation not allowed on ImmutableDict")
TypeError: Operation not allowed on ImmutableDict
```
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [December 4, 2024, 9:15am UTC](https://discuss.tryton.org/t/error-in-quality-module/8088/2 "2024-12-04T09:15:07Z")
Please [fill an issue](https://bugs.tryton.org/).
---
### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [December 4, 2024, 9:56am UTC](https://discuss.tryton.org/t/error-in-quality-module/8088/3 "2024-12-04T09:56:50Z")
> **[Error when changing control in inspection with points filled (#13730) ยท Issues...](https://foss.heptapod.net/tryton/tryton/-/issues/13730)**
>
> To reproduce: create an Inspection, define a control, add a point in the inspection with a correct value, and then try to change the control, that error is...