Hey everyone, 

I have this One2many field displayed as a tree view, and I want to prevent creation and deletion of rows conditionally, but also leave the existing rows editable, so 'readonly' wont work for me.

I tried attrs="{'create': [('order_type', '!=', 'renewal)]}" same for delete, but it did not work, 

is it possible to do that form xml, without having to write some JS code ? 

thank you in advance!