Pin/Star a particular expense for quick reference
Pin/star a particular expense which can be accessed quickly for reference later something similar to the whatsapp star message feautre.
This pinned/star expense can be accessible either specific to the group or universally on homepage.

This would move the expense out of its order based on when it occurs. Many people would forget to unpin it and it would cause a lot of confusion among users.
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Abhishek commented
Sometimes we need to keep track of expenses which we can update later point in time. May be in 60 or 90 days. Example. Booked a movie ticket but cash back comes in 60 days. It difficult to keep track of such expense. May be making that transaction as star will help. One column as starred transaction can be added.