Perfect ORM Definitions
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<?php
use Doctrine\ORM\Mapping AS ORM;

/**
 * @ORM\Entity
 * @ORM\Table(schema="ecommerce_order", options={"charset":"utf8","collate":"utf8_unicode_ci"})
 * @ORM\ChangeTrackingPolicy("DEFERRED_IMPLICIT")
 */
class EcommerceOrder
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer", length=4, options={"unsigned":true})
     * @ORM\GeneratedValue(strategy="SEQUENCE")
     */
    private $id;

    /**
     * @ORM\Column(type="timestamp", nullable=true)
     */
    private $ordered_at;

    /**
     * @ORM\Column(type="string", nullable=true)
     */
    private $customer_note;

    /**
     * @ORM\Column(type="string", nullable=true)
     */
    private $internal_note;

    /**
     * @ORM\OneToOne(targetEntity="Address")
     * @ORM\JoinColumn(name="billing_address_id", referencedColumnName="id", unique=true)
     */
    private $BillingAddress;

    /**
     * @ORM\ManyToOne(targetEntity="Address")
     * @ORM\JoinColumn(name="delivery_address_id", referencedColumnName="id")
     */
    private $DeliveryAddress;
}

<?xml version="1.0"?>
<doctrine-mapping 
 xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" 
 xsi="http://www.w3.org/2001/XMLSchema-instance" 
 schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
  <entity 
     name="EcommerceOrder" 
     change-tracking-policy="DEFERRED_IMPLICIT" 
     schema="ecommerce_order" 
     repository-class="Doctrine\ORM\EntityRepository">
    <id name="id" type="integer" length="4">
      <generator strategy="SEQUENCE"/>
      <options>
        <option name="unsigned" value="true"/>
      </options>
    </id>
    <field name="ordered_at" type="timestamp" nullable="true"/>
    <field name="customer_note" type="string" nullable="true" version="true"/>
    <field name="internal_note" type="string" nullable="true" version="true"/>
    <many-to-one field="DeliveryAddress" target-entity="Address">
      <join-columns>
        <join-column 
                 name="delivery_address_id" 
                 referenced-column-name="id" 
                 on-delete="CASCADE"/>
      </join-columns>
    </many-to-one>
    <one-to-one field="BillingAddress" target-entity="Address">
      <join-columns>
        <join-column 
                 name="billing_address_id" 
                 referenced-column-name="id" 
                 unique="true" 
                 on-delete="CASCADE"/>
      </join-columns>
    </one-to-one>
    <options>
      <option name="charset" value="utf8"/>
      <option name="collate" value="utf8_unicode_ci"/>
    </options>
  </entity>
</doctrine-mapping>

EcommerceOrder:
  type: entity
  changeTrackingPolicy: DEFERRED_IMPLICIT
  schema: ecommerce_order
  repositoryClass: Doctrine\ORM\EntityRepository
  fields:
    id:
      id: true
      type: integer
      length: 4
      generator:
        strategy: SEQUENCE
      options:
        unsigned: true
    ordered_at:
      type: timestamp
      nullable: true
    customer_note:
      type: string
      nullable: true
      version: true
    internal_note:
      type: string
      nullable: true
      version: true
  options:
    charset: utf8
    collate: utf8_unicode_ci
  oneToOne:
    BillingAddress:
      targetEntity: Address
      joinColumns:
        billing_address_id:
          referencedColumnName: id
          unique: true
          onDelete: CASCADE
  manyToOne:
    DeliveryAddress:
      targetEntity: Address
      joinColumns:
        delivery_address_id:
          referencedColumnName: id
          onDelete: CASCADE