How to prevent showing the previously selected value in one2many widget?

Question

I've added a new field to "hr.contract" which is a one2many to another model "X". Each record of "X" has a many2one field to another model "Y".  So the design is like this:    "hr.contract" -----one2many----> "X" -------many2one-----> "Y"
In "hr.contract" view, I have a one2many widget for "X". Each line of it contains a dropdown for "Y".
Now, here's what I'm after. In each line of "one2many" widget, I want the dropdown list (for many2one field) to contains only records of "Y" that has not been

ayman mohammed adam · Accepted Answer

Dear Reyhaneh Abdi

you can do that by overwrite *fields_view_get*
you can pass previously lines on context and get the values... then make search values without previous values:
Try overwrite this:
@api.model
def fields_view_get(self, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):
res = super(MkStudyClass, self).fields_view_get(view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
doc = etree.XML(res['arch'])
nodes = doc.xpath("//f

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