Sir,
So far I am exposed and have experience, never came across a PQWL from origin to destination. The PNR on which you think having gained support, is not pertaining to a booking from the Origin but from the first halt entoute.
It is ever seen from an intermediate station to another intermediate station or Destination AND from the Originating Station to an intermediate station ONLY. Exclusion is just "from Origin to Destination" i.e. "End to End".
Yes,...
more... it may be the case that even from an intermediate station to another intermediate station or Destination AND from the Originating Station to an intermediate station it is not termed as PQWL (or RLWL) but simply indicated with WL.
Mr. Murli was right in his brief explanation.