Filing requirement for draft offer documents and addenda prompts board observations and mandatory revised filings. The issuer must file, through lead manager(s), the draft offer document under home country requirements with an addendum containing Part C Schedule VIII disclosures as a confidential filing with fees specified in Schedule III, and must submit an undertaking from the overseas custodian and domestic depository to comply with rights issue obligations. The Board may issue observations or specify changes within thirty days from the later of specified triggering events, and where changes are specified the issuer and lead manager(s) must file a revised draft and updated addendum incorporating those changes.