CHAPTER VIII SET-OFF, REFUNDS, ETC. 48. Set-off, refund, etc.:- (2) No set-off or refund as provided by any rules made under this Act shall be granted to any dealer in respect of any purchase made from a registered dealer after the appointed day, unless the claimant dealer produces a tax invoice, containing a certificate that the registration certificate of the selling dealer was in force on the date of sale by him and the due tax, if any, payable on the sale has been paid or shall be paid and unless such certificate is signed by the selling dealer or a person duly authorised by him.
Conclusion : You can quote this section and provide with the copy of all tax invoices dulky signed and also provide sample lorry receipts. You can write in letter that claimant dealer shall not be liable to pay the tax since supplier has paid the tax and declaration on invoice is mentioned. So default on part of other dealer of not filing J1 should be dealt by department and the defaulting dealer. Honest dealers and taxpayers should not be penalised for the right acts.