Karnataka vat query

Dear Sir/Mam,

Is it necessary to submit all purchases and sales invoices particulars to K-VAT dept.?? Recently i noticed in K-VAT website that,  All the Purchases &sales particulars have to be converted into xml file & submit to the dept.

But, for all these days, i just used to provide purchase and sales figures while filing the monthly returns. Thats it.

Please guide me in this regard at the earliest.

Thanking you,