# Filter Attribute Not allowing to fill Many2One field
**URL:** https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007
**Category:** Developer
**Created:** [March 9, 2023, 9:33am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007 "2023-03-09T09:33:14Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [March 9, 2023, 9:33am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/1 "2023-03-09T09:33:16Z")
Hi,
I have a One2Many that are attachments of files and directories and If an attachment have parent shoudn’t display on top level, you should have to open the parent to see it.
I have the o2m field with the attribute filter=[‘parent’, ‘=’, None]. And a Many2One with the name of the parent that is the one I use in the filter. The problem that I’m getting is that the filter is doing good, but when I click on a record of the o2m and try to fill the parent field, no options are displayed.
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [March 9, 2023, 9:39am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/2 "2023-03-09T09:39:10Z")
> [@shervas](#):
>
> I click on a record of the o2m and try to fill the parent field, no options are displayed.
It is normal as the filter constraint the `parent` to be `None`.
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### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [March 9, 2023, 9:41am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/3 "2023-03-09T09:41:52Z")
And if I want to be able to fill the m2o and filtering the o2m view how can I do it?. Also both fields are pointing to the same model.
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [March 9, 2023, 9:46am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/4 "2023-03-09T09:46:53Z")
> [@shervas](#):
>
> if I want to be able to fill the m2o and filtering the o2m
You can not because it is illogical.
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### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [March 9, 2023, 10:19am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/5 "2023-03-09T10:19:33Z")
So which is the way to have a o2m tree view with different levels?
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [March 9, 2023, 10:53am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/6 "2023-03-09T10:53:41Z")
You can use `filter` but the tree structure has to be created from `One2Many` on the nodes.
Like it is done for packages on shipment see [Use filter instead of Function field for root packages (!353) · Merge requests · Tryton / Tryton · GitLab](https://foss.heptapod.net/tryton/tryton/-/merge_requests/353)
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### Author:  [@shervas](https://discuss.tryton.org/u/shervas)
#### Post date: [March 9, 2023, 11:03am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/7 "2023-03-09T11:03:26Z")
Yess, thanks a lot for the help!
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### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [April 8, 2023, 11:03am UTC](https://discuss.tryton.org/t/filter-attribute-not-allowing-to-fill-many2one-field/6007/8 "2023-04-08T11:03:53Z")
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