Thanks for the suggestion, Simon.
If I’m honest, this would be littered with complications and potential for mistakes. What should Breww do if, for example, you deliver an order today using keg 123 and then upload a stock take for yesterday stating that keg 123 doesn’t exist anymore? That’s just one example of the sort of problem with trying to rewrite history, but there would be so many scenarios like that that would need to be accounted for.
We would far rather build the highly voted Improve stock take to allow a web (non-CSV) based solution instead. As it sounds like that would also resolve your request, I’ll close this suggestion in favour of that one. Cheers.