Hi,

I try to define a relation between an abstract and "normal" model running Odoo15.

class A(models.AbstractModel):
	_name = 'a'
	part_ids = fields.One2many('part', a_id)

class Part(models.Model):
	_name = 'part'
	a_id = fields.Many2one('a')

class B(models.Model):
	_name = 'b'
	_inherit = 'a'
	y = fields...

class C(models.Model):
	_name = 'c'
	_inherit = 'a'
	x = fields...

A should be a generalization for B and C which both can have associated parts.
But whenever I try to add a new Part object to a B or C instance, I'll get the message 'a' object has no attribute 'id'. Somehow this seems logical as A is abstract. Well. What is the correct approach defining such a relation?

Thanks in advance,

Wolfgang