Form-I for SEZ Intra state Sale

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Sir my company situated in punjab state and we had supplied material to SEZ customer in FY 2012-13 in same state at zero rated sales and not chared Vat on the same. now while assessment of FY 2012-13 ETO has demanding the Form-I against the same. but as per my knowledge Form-I will issue for CST sale only.
I just wants your opinion on the same.