List of expenses can now be configured after creation. Debts simplification tested and approved! It had been 5 months that we hadn't settle accounts with my roommates. We had more than 100 expenses shared among different configuration of roommates. Those expenses induced 43 debts between us. Finally they were reduced to 5 transactions! The algorithm has been improved : it didn't simplify the case A→B, A→D, C→B, C→D. It has been really totured with that excercise. I carefully checked the results it's produced and I'm totally satisfied now.