Prem.. As PK sir said .. Its no issues at all.. Well if you have a option to board from Banaswadi then try that as well.. You will be safe.. Pk Sir correct me if wrong..
The TTE will alot the seat only if the passenger doesnt join until the next station.
IN this instance for this train after YPR.. the train stops at BAND... SO if Prem boards at BAND he is still safe isnt it.. The BOSS rule might not apply there isnt it :-)