Hi, i am a newbie in odoo programming. I got this warning when creating  a One2many field relation, where I took the data from the Many2one field in the same model. 

Here is my custom code:

class ReferInherit(models.Model):
	_inherit = 'qc.inspection'

	reference_line = fields.One2many('qc.inspection', 'picking', readonly=False, store=True)

and I took the data from here:

class QcInspection(models.Model):
    _inherit = 'qc.inspection'

    @api.multi
    @api.depends('object_id')
    def _compute_picking(self):
        for inspection in self:
            inspection.picking = False
            if inspection.object_id:
                if inspection.object_id._name == 'stock.move':
                    inspection.picking = inspection.object_id.picking_id
                elif inspection.object_id._name == 'stock.picking':
                    inspection.picking = inspection.object_id
                elif inspection.object_id._name == 'stock.pack.operation':
                    inspection.picking = inspection.object_id.picking_id

    picking = fields.Many2one(comodel_name="stock.picking", compute="_compute_picking", store=True)

When I run it, I got this Warning:

The operation cannot be completed: another model requires the record being deleted. If possible, archive it instead.

Model: Quality control inspection (qc.inspection), Constraint: qc_inspection_picking_fkey

what's wrong with my code? and how to solve it? Sorry for my bad english and Thanks before.