Description:
In Odoo 17, to ensure that One2many records are deleted when the parent record is deleted, you need to configure the One2many field with the proper ondelete attribute. This attribute controls the behavior of related records when the parent record is deleted.
Set ondelete='cascade' on the One2many field to automatically delete related records when the parent record is deleted. The ondelete parameter is used in relation fields to define the action taken on related records upon deletion of the parent record.