It means that the International Bureau has received the priority document, which will have the date of receipt and whether the priority document complies with the provisions of Article 17. 1(a) or (b) of the PCT Rules.
PCT/IB/306 table:
Notice of change record.
It means that the PCT international application submitted a request for record change in the international stage and was accepted. Changes in records include changes in the descriptive information of applicants, inventors, agencies and agents.