Wherever, import of Penicillin and its salts (ITC HS Code No.29411010) or import of 6-APA (ITC HS Code No.29411050) is allowed as an input item under Duty Exemption Scheme, the export obligation period for such licences shall be restricted to six months from the date of clearance of first import consignment. The licensing authority shall make an endorsement in the Advance Licence to this effect. No further extension in export obligation period shall be allowed in these licences.