There is a bug in which one friend can delete bills in which he is not involved. This will delete the payments made made amongst other peopl
Deleting a payment by you in which you are not involved should be disabled.
I assume this is a bill added in a group and not a bill between two friends (bills between friends can only be changed by people on the bill). Anything added to a group can be edited and viewed by anyone else in the group. We do this so that anyone in the group can make corrections (for example: the payment was listed to the wrong person). In you user settings you can ask to be notified by email when expenses are added or changed and in the dashboard on the web you can undelete recently changed expenses.
Marshall
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Viral commented
There should be log/audit of all changes