If a user has not seen a new bill, the user should get a reminder that he has to fill out his contribution to all the items. All items from the bill gets displayed to the user one at the time, and the user can decide on each item if he is an contributor.
If a user has not seen a new bill, the user should get a reminder that he has to fill out his contribution to all the items. All items from the bill gets displayed to the user one at the time, and the user can decide on each item if he is an contributor.