Inter State supply reporting: Mandate to report place of supply details and segregate ITC reversals in returns. Registered persons must report inter-State supplies to unregistered persons, composition taxpayers and UIN holders place-of-supply-wise in Table 3.2 of FORM GSTR-3B and the matching tables in FORM GSTR-1; portal auto-populates Table 3.2 from GSTR-1 but suppliers must ensure correct customer state data. Table 4(A) of GSTR-3B is auto-populated from GSTR-2B; permanent reversals and ineligible ITC must be reported in Table 4(B)(1), temporary/reclaimable reversals in Table 4(B)(2), and Net ITC credited equals 4(A) minus the sum of 4(B)(1) and 4(B)(2).