Error: psycopg2.errors.ForeignKeyViolation: insert or update on table "pma_contract" violates foreign key constraint "pma_contract_lessor_fkey"

DETAIL:  Key (lessor)=(2) is not present in table "pma_contract_lessor_profile".

In model "pma.contract.lessor.profile", I create a new field: 

 contract_id = fields.One2many("pma.contract", "lessor", string="Contract member")

In model "pma_contract, I changed:

    lessor = fields.Many2one("res.users",
	​	​string="Party A (Lessor)",
	​	​store=True,  required=True,  tracking=True)

to:

 
    lessor = fields.Many2one("pma.contract.lessor.profile",
	​	​string="Party A (Lessor)",
	​	​ store=True,  required=True,  tracking=True