Sir, still you are pressing wrong interpretation.
My ticket was booked as HTE-YPR in 3AC of HTE-YPR SF Exp. latter i changed my boarding to SBP. now my ticket was old and unchanged by on PNR query result it was clearly showing as BOarding from SBP. and the chart display was SBP-YPR not as HTE-YPR boarding at SBP. when chart clearly shows your Ticket+Boarding as per new status how any one can board from original boarding point?
*travel in lower class is allowed under certain specified conditions and the passenger is entitled for...
more... refund under rules.
**Please refer Trains at a Glance(july 2010 edition) page 253.