11.3: How many 'levels' deep?

[gs]

While I am not entirely sure from the wording in the document, does this rule only concern itself with comparisons "one level deep"? For example, casting "cv1 type *" to "cv2 type *" is prohibited but "cv1a type * cv1b *" to "cv2a type * cv1b *" is allowed? Would this mean casting "cv1a type * cv1b *" to "cv2a type * cv2b *" is then prohibitted? [Presume each 'cv#' combination is unique.] While the text of the last two examples suggests the answer is "Yes", I'd like to double check.