Transitional credit filing: one-time portal filing or revision allowed, subject to verification and officer scrutiny. Guidelines allow aggrieved registered persons to file or revise Form GST TRAN-1/TRAN-2 on the common portal during a limited one-time window; forms may be edited only before submitting, after which they freeze and must be filed with DSC or EVC. Applicants revising must download prior submissions, upload Annexure A declaration and TRANS 3 if applicable, and deliver a self certified copy with supporting records to the jurisdictional tax officer within seven days. Claims are subject to officer verification, adjudication on merits, and, if allowed, reflection in the electronic credit ledger.