# One2Many domain restriction

**URL:** https://discuss.tryton.org/t/one2many-domain-restriction/8023
**Category:** Developer
**Created:** [November 8, 2024, 4:55pm UTC](https://discuss.tryton.org/t/one2many-domain-restriction/8023 "2024-11-08T16:55:27Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![lb1975](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/l/d6d6ee/32.png) [@lb1975](https://discuss.tryton.org/u/lb1975)
#### Post date: [November 8, 2024, 4:55pm UTC](https://discuss.tryton.org/t/one2many-domain-restriction/8023/1 "2024-11-08T16:55:28Z")

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Hi,

I’m wondering the best way to get a tab called “Fees” in the Purchase form with just a sub select of puchase.line with product.type = ‘service’. I’ve tried to add a One2Many field with domain Eval(product.type) == ‘service’ but it doesn’t work.  
Any ideas ?

Tks,  
Laurent

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### Author: ![ced](https://discuss-cdn.tryton.org/user_avatar/discuss.tryton.org/ced/32/1237_2.png) [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [November 8, 2024, 5:10pm UTC](https://discuss.tryton.org/t/one2many-domain-restriction/8023/2 "2024-11-08T17:10:05Z")

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You can use a `One2Many` with a [`filter`](https://docs.tryton.org/latest/server/ref/fields.html#trytond.model.fields.One2Many.filter) like `[('product.type', '=', 'service')]`.

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### Author: ![lb1975](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/l/d6d6ee/32.png) [@lb1975](https://discuss.tryton.org/u/lb1975)
#### Post date: [November 8, 2024, 5:31pm UTC](https://discuss.tryton.org/t/one2many-domain-restriction/8023/3 "2024-11-08T17:31:04Z")

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Top !  
So simple don’t know why I have tried only with domain attribut…  
Tks a lot Cédric.

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### Author: ![system](https://discuss-cdn.tryton.org/uploads/default/original/1X/c6f8ec0a40525cdcd50058c734283450a4b3d38b.png) [@system](https://discuss.tryton.org/u/system)
#### Post date: [November 9, 2024, 5:31pm UTC](https://discuss.tryton.org/t/one2many-domain-restriction/8023/4 "2024-11-09T17:31:23Z")

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