To me, "traversal" only happens when the engine steps into a member marked as cascaded (`@Valid`), but this isn't the case for cross-parameters. How about adding a separate para after this one:

> If path nodes are added in a constraint validator implementation using the node builder API (see section 3.4), the following nodes are appended to the path generated by the Bean Validation engine as previously described:
>
> * A `PropertyNode` will be appended in case `addPropertyNode()` was invoked
> * A `ParameterNode` will be appended in case `addParameterNode()` was invoked
> * A `BeanNode` will be appended in case `addBeanNode()` was invoked