refund of accumulated ITC on account of ZERO rated supply

Refund of ITC and duty drawback in respect of tax suffered on same goods, cannot go together, since that would amount to double benefit to the exporter. In your case, i find that you are claiming drawback on packing material and refund of ITC of tax suffered and accumulated in respect of other items. In such a situation, there is no bar and in my view, you can claim refund and drawback simultaneously.