Recordkeeping for Credit Transfer Documents requires detailed CTD fields to substantiate CENVAT credit claims under the rules. Insertion of TRANS 3B requires dealers claiming credit on Credit Transfer Documents (CTDs) under the CENVAT Credit Rules, 2004 to maintain specified fields for each CTD: CTD number; invoice numbers against which the CTD was issued; months in which clearances against those invoices occurred; GSTINs of all intermediate buyers and sellers; value of goods; and central excise duty paid on them.