Unique common enrolment number enables multi state transporters with same PAN to obtain a single enrolment restricting GSTIN use. A unique common enrolment number allows transporters with registrations in multiple States or Union Territories under the same PAN to apply via FORM GST ENR-02 using any one GSTIN; upon validation a single enrolment is issued and thereafter the transporter may not use individual GSTINs for Chapter XVI purposes.