Revised returns

Hello Friends

        I have prob in filing the VAT revised returns for the month of  April 2012 under KVAT Act....

For the month of April 2012 I have  filed returns in which I have taken wrong Input for which I have got Huge refund for the particular month. Now my prob is after 3 months i.e in the month of June 2012 there is a tax liability arises but due to wrong input taken in the month of April I am not able to make revise returns. 

Please guide me how to file the June returns where i need to pay the Tax but there is C/F amount showing in VAT returns.

Regards

ASBVAT