It seems that it can be a receipt.

vide challan or receipt No.
http://www.crcp.org.pk/FOI Rules 2004.PDF

Payment Challan (receipt)
http://www.dhakacity.org/html/per_multi_buil.html

http://nagaland.nic.in/citizenservices/Forms/chln_fr_iv.doc

And in the banking context this seems the most logical solution.

But it can also be a special form:

"5. What is a challan ?

CBDT has defined specific forms (aka Challans) for each type of tax. These are required to be filled in by the taxpayer and submitted along with the cheque/cash at the bank counter. The Challans are as follows:
A common single copy challan No. ITNS 280 for payment of Income tax, Corporation tax and Wealth tax ;
A common single copy challan No. ITNS 281 for depositing Tax Deducted at Source from corporates or non-corporates;
A common single copy challan No. ITNS 282 for payment of Gift-tax, Estate Duty, Expenditure Tax and Other direct taxes. For Income Tax and Corporation Tax, there will be different challans, one for Tax Deducted at Source (TDS) and one for regular taxes. "
http://www.hdfcbank.com/fsp/bank-taxcollection-faqs.htm#five

I think you need the first meaning, receipt. But i'm not an expert on Eastern financial topics, so somebody else might have a better idea.

You should wait at least 24 hours, so that people have enough time to react.