Refund entitlement for exporters under bond: monthly Modvat credit claims allowed where export clearances meet required threshold, forms revised. Amendment permits refund claims of Modvat credit for inputs used in goods exported under bond to be made monthly where average export clearances of dutiable goods in value terms in the preceding three months meet a high-threshold proportion of total clearances; otherwise calendar-year periodicity remains. The Appendix and Form A are amended to read 'quarter or month,' and Form A reference '12(A)' is replaced with '12(1)(b)' to reflect the monthly claim option.