code: public Object doReverseOne(
              JTransfo jTransfo, Object domainObject, SyntheticField toField, Class<?> toType, String... tags)
              throws JTransfoException {
          return jTransfo.convertTo(domainObject, jTransfo.getToSubType(toType, domainObject), tags);
      }
docs: Do the actual reverse conversion of one object.
  
  @param jTransfo jTransfo instance in use
  @param domainObject domain object
  @param toField field definition on the transfer object
  @param toType configured to type for list
  @param tags tags which indicate which fields can be converted based on {@link MapOnly} annotations.
  @return domain object
  @throws JTransfoException oops, cannot convert