Rectification order u/s 154

I have applied for rectification for AY 2013-14 and received a Rectification Order u/s 154 after few weeks.
the order is showing demand which is genuine and I want to pay it.
but on logging into e- filing site there is no any outstanding demand.
In the rectification order there is a challan attached in the last page with all filled details.
so what if I want to e-pay the demand??