You can reduce, but with a reason
No reason, no change to the amount. The reason stays in the line’s history, so nobody has to dig through chats to find out who cut the amount.
Every decision has an author
Who approved, reduced or rejected a line — with the date and time.
Payment categories
Subcontracting, materials, other and your own categories.
Carried to the next register
Undecided lines move to the next register by themselves.