TDS Rates & TDS Calculator

We have supplied to one SEZ after 10.02.2006 without charging ED / ST, and received payment in INR. We have not taken any advance license for the supplies. Now we want to claim DBK / DEPB for the same. Please guide us, can we claim the same. If so, what document we require to claim the benefit and time frame to claim. If bill of export is not available, what is the procedure to claim the benefit.  Can any other documents e.g. ARE1 will solve the purpose ??

We are executing one turnkey contract at Uttarakhand, where we have received separate PO for supply and ETC.  Now the concerned purchaser is intending to deduct WCT TDS on our supply portion.  Is it justified ? if not how can we propose them not to deduct tds from our supply portion.  Can you forward some document to present before them on this issue.