APIP single table inheritance

CreditNote.php

<?php
/**
 * @ORM\Entity
 *
 * @ApiResource(
 *     normalizationContext={"groups"={"creditNote:read"}},
 *     collectionOperations={
 *          "get"={"controller"=NotFoundAction::class}
 *     },
 *     itemOperations={
 *          "get"
 *     }
 * )
 */
class CreditNote extends Redeemable
{

}

Redeemable.php

<?php

/**
 * Class representing either a Voucher or a CreditNote.
 *
 * @ORM\Entity
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\DiscriminatorColumn(name="discr", type="string")
 * @ORM\DiscriminatorMap({"voucher"=Voucher::class, "credit_note"=CreditNote::class})
 */
abstract class Redeemable
{
  
}

Voucher.php

<?php
/**
 * @ORM\Entity
 *
 * @ApiResource(
 *     normalizationContext={"groups"={"voucher:read"}},
 *     collectionOperations={
 *          "get"={"controller"=NotFoundAction::class}
 *     },
 *     itemOperations={
 *          "get"
 *     }
 * )
 */
class Voucher extends Redeemable
{

}