; and (2) in subsection (b) by adding at the end the following new paragraph: (6) Nothing in this section shall require notice to be sent for a supplemental claim that is filed within the timeframe set forth in subsections (a)(2)(B) and (a)(2)(D) of section 5110 of this title. . (c) Section 5103A(f) of title 38, United States Code, is amended to read as follows: (a) Rule with respect to disallowed claims Nothing in this section shall be construed to require the Secretary to readjudicate a claim that has been disallowed except when new and relevant evidence is presented or secured, as described in section 5108 of this title. . (d) Chapter 51 of title 38, United States Code, is amended by adding the following new sections: 5103B. Applicability of duty to assist (a) The Secretary’s duty to assist under section 5103A of this title shall apply only to a claim, or supplemental claim, for a benefit under a law administered by the Secretary until the time that a claimant is provided notice of the Agency of Original Jurisdiction’s decision with respect to such claim, or supplemental claim, under section 5104 of this title. (b) The Secretary’s duty to assist under section 5103A of this title shall not apply to higher-level review by the Agency of Original Jurisdiction, pursuant to section 5104B of this title, or to review on appeal by the Board of Veterans’ Appeals. (c) Correction of duty To assist errors (1) Higher-level review If, during review of the Agency of Original Jurisdiction's decision under section 5104B of this title, the higher-level reviewer identifies an error on the part of the Agency of Original Jurisdiction to satisfy its duties under section 5103A of this title, and that error occurred prior to the Agency of Original Jurisdiction's decision being reviewed, unless the claim can be granted in full, the higher-level reviewer shall return the claim for correction of such error and readjudication. (2) Board of Veterans’ Appeals If the Board, during review on appeal of an Agency of Original Jurisdiction