Purchase of goods or services from business premises to check tax invoice :
The Commissioner or an officer authorised by him may cause purchase of any goods or services or both by any person authorised by him from the business premises of any taxable person, to check the issue of tax invoices or bills of supply by such taxable person, and on return of goods so purchased by such officer, such taxable person or any person in charge of the business premises shall refund the amount so paid towards the goods after cancelling any tax invoice or bill of supply issued earlier – section 67(12) of CGST Act.