<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">

    <embedded-document name="Integrated\Bundle\PageBundle\Document\Page\Grid\Row">

        <embed-many field="columns" target-document="Integrated\Bundle\PageBundle\Document\Page\Grid\Column" strategy="set" />

    </embedded-document>

</doctrine-mongo-mapping>

<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">

    <embedded-document name="Integrated\Bundle\PageBundle\Document\Page\Grid\Row">

        <embed-many field="columns" target-document="Integrated\Bundle\PageBundle\Document\Page\Grid\Column" />

    </embedded-document>

</doctrine-mongo-mapping>

Remove strategy="set" from Grid\Column for INTEGRATED-1545
Remove strategy="set" from Grid\Column for INTEGRATED-1545
