code: @Override
  	public CommerceOrderItem fetchCommerceOrderItemByReferenceCode(
  		long companyId, String externalReferenceCode) {
  		return commerceOrderItemPersistence.fetchByC_ERC(companyId, null);
  	}
docs: Returns the commerce order item with the matching external reference code and company.
  
  @param companyId the primary key of the company
  @param externalReferenceCode the commerce order item's external reference code
  @return the matching commerce order item, or <code>null</code> if a matching commerce order item could not be found