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class parent 

category_id many2one

child_ids


class child 

parent_id

product_id


so,on select category at parent form view 

then select only product related to category

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Hi,
Please try with the below domain. Add it into the child product id field.

         domain="[('category_id', '=', parent.category_id)]"

Hope it will help you.
Up vote please.

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Invalid composed field farm_materials.category_id in domain of ([('categ_id', '=', farm_materials.category_id)])


also

ValueError: Invalid composed field materials.category_id in domain of ([('categ_id', '=', materials.category_id)])


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No Not that way.
you have to use the "parent" key on a right side of the domain. Not 'farm_materials' or 'materials'.

please take the reference from here :

https://github.com/odoo/odoo/blob/15.0/addons/account/views/account_move_views.xml#L902

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