Offer document update requirements: material changes trigger fresh or updated filings with fees and board confirmation before proceeding. The regulations specify three filing tracks for offer-document changes: (1) fresh draft filing with fees for major corporate or issue-level alterations affecting control, board composition, main object clause, material changes to issue size or means of finance, or where regulatory compliance would be impacted; (2) updated offer document with fees for sectional updates such as material risk developments, significant changes in major shareholders, moderate adjustments to issue size, new directors, promoter-group additions, substantial profit/loss variations, and material litigation developments - with issuance only after Board confirmation; and (3) filing without fees for all other changes.