What are RP Change References and how are they numbered?
A. The RP Change Reference is a nine-digit number that ties the summary of a change in the Code, Regulations, or Proposed Regulations to other elements of the book. For example, it cross-references an entry from the Summary of Post-1999 Major Regulatory Activity to the corresponding entry in the Table of Post-1999 Regulatory History where you can find information regarding the applicable publication date, effective date, citation, and related legislation (if any). The RP Change Reference also identifies the summary with the corresponding Readable Regs. This navigation aid is especially useful where there are multiple sets of Proposed Regulations pending under the same Code section. The first five digits of the number refer to the applicable Code Section, while the next two digits refer to the year of publication. The final two digits identify the particular change, with numbers below 30 indicating a change to the Code and numbers 30 or higher indicating a change to the Regulations or P
