If a definite requirement is given for equivalence to a certain degree or one among certain degrees, with a Level 7 or 8, then that is not superseded by having a higher level degree. The reason for the Level 7 requirement seems to be as follows. In some countries, it's possible to gain a higher degree where some small aspect of a subject would be studied in great depth, without first having a bachelor degree which would prove that the candidate has the breadth and grounding from the basics of the subject upwards. Such a higher degree would be given a Level 8 or 9, but would not PROVE (as a Level 7 would) that the candidate has broad general understanding.