How to not make location capture uneditable to user

[DPM_reports]

Hi I have a table where I capture location twice the first location is the start of a journey and hence I put the here() expression in initial…however this would make the user manually change location if he wants to…for the end location I have put the expression in app formula and hence it’s not editable…

I am afraid if the put the start location in app formula instead of initial value…the location will once again change when the end location is captured…how do I overcome this issue