version odoo16: Record does not exist or has been deleted

Question

I created a record table A and created a sub table B of A, and later created a sub table C for sub table B. When I created and saved the records of sub table C, I was informed that, Record does not exist or has been deleted， I checked and it was a cache error, but I couldn't find the problem. Can someone help me? thanks

李兴华 · Answer

model：
class ModelA(models.model):
​_name = 'model.a'
​
line_ids = fields.One2many('model.b', 'a_id', string="Detail")
class ModelB(models.model):
​_name = 'model.b'
a_id = fields.many2one('model.a', string="Head")​
line_ids = fields.One2many('model.c', 'b_id', string="Detail")
class ModelC(models.model):
​_name = 'model.c'
​b_id = fields.many2one('model.b', string="Head")​​
line_ids = fields.One2many('model.b', 'a_id', string="Detail")

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