Request a correction on bill which is posted by others
If User1 posted a shared bill which includes User1 and User2, User2 should not be allowed to edit or delete the bill instead User2 may request correction in the bill to the User1
Bill may be edited or deleted only by the one who posted the Bill

At least for now, Splitwise’s policy is that anyone involved in a bill has the power to view, edit, or delete it. We realize this can make things difficult if two users disagree on a bill – but even if editing was disallowed, those two users could still just add more expenses to change things to their liking.
Requesting a correction is a reasonable solution, but we feel it sacrifices too much simplicity, and is too complex for the average user. For that reason, we’ve decided not to include that feature. We’re sorry for the inconvenience!
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Nagabhushan S.N. commented
Makes sense