serialization/unserialization of ClassMetadata lose reflFields order causing insertSql statement to fail

INSERT INTO table (a, b) VALUES (?, ?)
bind : $b, $a

INSERT INTO fna_client_revision (fna_parent_record_id, record_id, display_name, last_name, maiden_name, first_name, civility, gender, birthdate, employer, employment, employment_from, civil_status, civil_status_from, insurability, fna_client_fna_id, fna_spouse_fna_id, rev_no, created_at, modified_at, created_by, modified_by) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

Array
(
    [1] => 1
    [2] => George Simard2
    [3] => Simard2
    [4] =>
    [5] => George
    [6] =>
    [7] => MALE
    [8] => 1962-09-14
    [9] => Plomberie ABC Inc.
    [10] => Plombier
    [11] =>
    [12] => MARRIED
    [13] =>
    [14] => INSURABLE
    [15] => 5
    [16] => 2009-12-07 08:54:46
    [17] => 2009-12-07 08:54:46
    [18] =>  Eric Durand-Tremblay
    [19] =>  Eric Durand-Tremblay
    [20] => 1
    [21] =>
    [22] =>
)

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'employment' cannot be null

namespace ORM\BaseEntity;

/**
 * @MappedSuperclass
 */
class Entity
{
	private static $boolean_values = array("YES", 'NO');
	
	 /**
     * @Column(name="id", type="integer")
     * @Id
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;
    
    /**
     * @Column(name="created_at", type="datetime")
     */
    protected $created_at;
    
    /**
     * @Column(name="modified_at", type="datetime")
     */
    protected $modified_at;
    
    
     /**
     * @Column(name="created_by", type="string")
     */
    protected $created_by="";
    
    /**
     * @Column(name="modified_by", type="string")
     */
    protected $modified_by="";
}

/**
 * @MappedSuperclass
 * @HasLifecycleCallbacks
 */
class Revisionable extends ORM\BaseEntity\Entity
{

     /**
     * @Column(name="rev_no", type="integer")
     */
    protected $revision=1;
}


namespace ORM\BaseEntity;

/**
 * @MappedSuperclass
 * @HasLifecycleCallbacks
 */
class Client extends Revisionable
{

    /**
     * @Column(name="display_name", type="string")
     */
    protected $display_name;

    /**
     * @Column(name="last_name", type="string")
     */
    protected $last_name="";

    /**
     * @Column(name="maiden_name", type="string")
     */
    protected $maiden_name="";

    /**
     * @Column(name="first_name", type="string")
     */
    protected $first_name="";

    /**
     * @Column(name="civility", type="string")
     */
    protected $civility="";
    
    /**
     * @Column(name="gender", type="string", length="25")
     */
    protected $gender="";

    /**
     * @Column(name="birthdate", type="date", nullable="true")
     */
    protected $birthdate;

    /**
     * @Column(name="employer", type="string")
     */
    protected $employer="";

    /**
     * @Column(name="employment", type="string")
     */
    protected $employment="";

    /**
     * @Column(name="employment_from", type="date", nullable="true")
     */
    protected $employment_from;

    /**
     * @Column(name="civil_status", type="string", length="25")
     */
    protected $civil_status="";
    
    /**
     * @Column(name="civil_status_from", type="date", nullable="true")
     */
    protected $civil_status_from;
    
    /**
     * @Column(name="insurability", type="string", length="25")
     */
    protected $insurability="";

    
    /**
     * @OneToOne(targetEntity="ORM\Entity\FNA")
     * @JoinColumns({
     *   @JoinColumn(name="fna_client_fna_id", referencedColumnName="id")
     * })
     */
    protected $client_fna;

	/**
     * @OneToOne(targetEntity="ORM\Entity\FNA")
     * @JoinColumns({
     *   @JoinColumn(name="fna_spouse_fna_id", referencedColumnName="id")
     * })
     */
    protected $spouse_fna;
}


namespace ORM\RevisionEntity;

/**
 * @Entity
 * @Table(name="fna_client_revision", indexes={@index(name="idx_record_id", columns={"record_id"})})
 * @HasLifecycleCallbacks
 */
class Client extends ORM\BaseEntity\Client{
	
	 /**
     * @ManyToOne(targetEntity="Kronos\FNA\ORM\Entity\Client")
     * @JoinColumns({
     *   @JoinColumn(name="fna_parent_record_id", referencedColumnName="id", onDelete="SET NULL")
     * })
     */
    protected $parent_record;  /// HERE IS THE  FIELD WHO CHANGE PLACE AFTER SERIALIZATION !!!!!!!!!!!!!!!!!!!!!!
    
    /**
     * 
     * @Column(name="record_id", type="int")
     */
    protected $record_id;
}

   
    [1] => 1  (fna_parent_record_id)
(expected record_id)
    [2] => George Simard2 (display_name)
    [3] => Simard2 (last_name)
    [4] => (maiden_name)
    [5] => George (first_name)
    [6] => (civility)
    [7] => MALE (gender)
    [8] => 1962-09-14 (birthdate)
    [9] => Plomberie ABC Inc. (employer)
    [10] => Plombier (employment)
    [11] => (employment_from)
    [12] => MARRIED (civil_status)
    [13] => (civil_status_from)
    [14] => INSURABLE (insurability)
    [15] => 5 (rev_no)
    [16] => 2009-12-07 08:54:46 (created_at)
    [17] => 2009-12-07 08:54:46 (modified_at)
    [18] =>  Eric Durand-Tremblay (created_by)
    [19] =>  Eric Durand-Tremblay (modified_by)
    [20] => 1 (record_id) !! Should be in position  2
    [21] => (fna_client_fna_id)
    [22] => (fna_spouse_fna_id)