I checked your Same Station Exit page, but it didn’t quite apply to me- I have a travelcard on my Oyster, and only a few pence of PAYG credit left.
I touched in at a DLR station without gates, then needed to exit without making a journey. I tried a few times, after various intervals, to touch out, but each time, the reader always showed “entry”. In the end, I went one stop, touched out, and then touched in again and made the journey back.
Is there any way to ‘cancel’ an entry to avoid having to make such a journey?
Immediate same station exit doesn’t work at validators, only gates. With validators you need to wait until 2 minutes has passed at which point the cheapest single fare from that station will be charged. However, if the station is within the zones covered by your travelcard then there is no penalty for not touching out, you can just leave the touch in there. Finally, if the reason for not travelling was disruption or no service then the helpdesk will refund the entry charge if one had been made.
It depends. If the touch in is at a gate then it will be fine. If the touch in is at another validator then it may be treated as an exit. If the whole journey you eventually make is covered by your travelcard then there won’t be an issue. If travelling beyond the zones covered and both starting stations have validators and are within the zones covered by a travelcard then it might be safer to touch in on a bus (and get straight off). This will ensure that the second touch in is treated as a touch in and buses are always free with any travelcard.