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