Clameurs/sites/all/modules/contrib/fields/cer/extensions/cer_commerce/commerce_product_reference.inc

<?php

/**
 * @file
 * Contains a CER plugin for Commerce's Product Reference fields.
 */
 
class CerCommerceProductReferenceField extends CerField {

  /**
   * Implements CerField::getTargetType().
   */
  public function getTargetType() {
    return 'commerce_product';
  }

  /**
   * Overrides CerField::getTargetBundles().
   */
  public function getTargetBundles() {
    // Product reference fields store their referenceable types by instance
    // instead of by field, so the $this->settings variable we inherit
    // from CerField is useless here.
    $instance = field_info_instance($this->entityType, $this->name, $this->bundle);
    $types = $instance['settings']['referenceable_types'];

    return ($types ? $types : parent::getTargetBundles());
  }

}