I've got a model (Model_A) that has a One2many relation to his positions model (Model_B). That model (Model_B) has a Many2many related field that I want to filter based on partner_id.

The views are Model_A form view with list for Model_B that is not editable, so it opens a popup view for creating/editing Model_B records. When adding a new record to Model_B in the popup view the filter works, but if I edit the record there is no filter applied on the Many2many field.

The partner_id field is a related field from parent Model_A

partner_id = Many2one(related='Model_A.partner_id')

And I tried even with a non related field. The problem is still there. 

I cannot use any python method to set the domain with onchange because it doesn't depend on anything and on create it works, on edit there will nothing be changed only records added/removed to this Many2many field. 

Does someone know what can be the problem or how to fix the issue?