(1) Notwithstanding anything contained in section 19, or section 26 and subject to such rules as may be prescribed, it shall be open to the prescribed authority or any other officer authorised by the Commissioner in this behalf to make provisional or final assessment of turnover of sale or purchase of goods, as the case may be, effected by any dealer residing outside the State of Bihar and carrying on business temporarily by way of fair, mela or by way of any other similar mode in the State of Bihar.
     (2) If a dealer referred to in sub-section (1) claims that the sales affected by him are not of goods imported by him, the onus to prove such claim shall lie on the claimant.