Good morning ... I'm trying to make a domain to a many2one field that is inside a one2many.
Let me explain ... in a model with its form view I have a field A many2one that points to the res.partner. 
in the same form I have a one2many field that points to another model and in that model there is a B field that is a many2one and it also points to the res.partner. 
what I want with the domain is that I filter field B and put only the partners whose parent_id is equal to field A

I leave view code but it does not work for me
Thanks in advance

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ps both fields A and B are named partner_id