/** @{@inheritDoc} */
@Override
public String toString() {
return super.toString() + ": " + crn.toString();
}
/** {@inheritDoc} */
public <UJO extends Ujo> ValidationError validate(VALUE input, Key<UJO, VALUE> key, UJO bo) {
final boolean ok = input == null || crn.evaluate(input);
return !ok ? createError(input, key, bo, service.map(CRN, crn.toString())) : null;
}