Make product id and type mappable

gistfile1.php

// Add new alter hook in _salesforce_mapping_get_entity_fields

// Give other modules a chance to alter the entity fields available for mapping.
drupal_alter('salesforce_mapping_entity_fields', $entity_fields, $entity_type, $entity_bundle_type);

/**
 * Implements hook_salesforce_mapping_entity_fields_alter().
 */
function salesforce_line_item_salesforce_mapping_entity_fields_alter(&$entity_fields, $entity_type, $entity_bundle_type) {
  if ($entity_type == 'commerce_line_item' && $entity_bundle_type == 'designation') {
    $entity_fields['Product']['commerce_product:product_id'] = 'Product ID';
    $entity_fields['Product']['commerce_product:type'] = 'Product Type';
  }
}