Section 14(2)(i) in The Central Motor Vehicles (Accreditation of Bus Body Builders) Order, 2007
(i)Zonal Accreditation Board Secretariat, on receipt of the application along with its enclosures and the requisite fees, etc. shall issue an acknowledgement along with receipt to Bus Body Builder within ten working days, allotting unique Customer Registration Number (CRN) to Bus Body Builder, to be used in future for reference and correspondence;