Changing Entry Id manually

I have an Excel file that contains Entry Id numbers for entries starting with 0.  Keeping the Id numbers the same is important for future communication purposes. Now, I don't know if this 0 is the cause, but I can't seem to get the file imported (after converting it to xml) - probably some other reason though, since I'm pretty sure Multiterm would just skip that entry and get the others in. There should be a report of some sort somewhere, can't find it. But.

Whatever the cause, I am now trying to add at least some of the entries manually. But when I add a new entry, the entry is automatically numbered "1". How can I change this to "0" or at least "o"?