Unauthorized entries appear in my spreadsheet.

Hi Patrick....Very insightful of you...thanks....I can see where those changes occurred and at what time which matches when I first noticed them. I certianly did not put them there intentionally as the columns are date columns and those additions are the wrong date and wrong colour. How it has happened I don't know...What I have learned form the experience is that I need to change the name of the file every couple of hours, so that in the event of something like this happening again I can minimise the amount of time lost and re start with the latest file that does not have those unauthorised changes Again thanks so much for your input...Cheers...Phil