Harry Monk:
“Don’t do manual entries” is the moral of the story here.
Respect the voice of wisdom and experience.^^^^^^^
I will add a caveat or two however.
Tacho is not a common sense game. You make an obvious administrative only error and there in a minority of Coppers/Dvsa that will happily do you for this so take Harry’s advice.
If it is blatantly obvious you still need a manual entry then perhaps consider very carefully what you will enter.
As said already, never sweat a mistake. Simply do a printout immediately and enter the correct version on the back of the printout and this has priority over all other records. Then crack on and have a nice day 