Deleting info in locked cells/columns

Willem & Ron,

Here is an abbreviated version of the sheet I am working with. As you can see, Columns C, D, F, and G need to be able to be edited. It is information in the E column ("Miles") that I have locked that people continue to delete.

I know I could move that column over and eliminate the problem, but it was requested I leave the grouping as is.

I know this is a very minor thing...I am just curious as to whether or not there is a solution!

Thanks again for all your help!