I need to add an additional field (called client). When I try to do this, I get the "no suitable constructor found" error. I don't understand what I am doing wrong or where else to look.
What were the steps you took to add this property?
If you have added a parameter to the Constructor, then you will get this error message place in your code where you were creating this object, because none of those places will be passing a client (which you have to now)
Know thy IDE. If you're changing a method signature, Eclipse has a refactoring for that. Find "Refactor..." in your context menu (the menu you get when you right-click on the part of the code you want to change). Eclipse will do the work of finding all the references for you -- it will do the heavy lifting.
I've worked with systems of that size and while there's a lot to complain about in that class (String variables for obvious numeric values? Exactly 10 cost centers?) it doesn't look outrageous to me. Refactoring might be a good idea but in a system of that size you need a strategy.
As for Eclipse, I find that when you change something it automatically flags everything which became an error because of that change. No searching should be required, that's why you have the IDE. Perhaps it's set to not rebuild after every change? That wouldn't be surprising for a large code base. If you rebuild the project then you'll see all the errors you have to fix.
I don't know, that many parameters in a constructor is pretty outrageous to me. And they are all Strings for crying out loud. Granted, I've seen worse code than this but still...
And this:
"Chargeses" ... really?! "ChargesList" never crossed someone's mind here? It's not a typo either. Somebody actually went like, "Well, I already have a 'charges' variable, so what do I name this list of them...? Let's go with 'Chargeses' ..." Sorry but for me there's really no excuse for that.
like I said - I inherited this code. There are multiple places where a word is intentionally spelled wrong. Probably doesn't help that the initial authors were from Bolivia.
Don't take my comments the wrong way. It's just that these kinds of things are among my pet peeves, and I have a few that I just can't help but comment about when I see them. Good names are very important to me and actually refactoring them in code like this takes very little effort. If I can think of a better name for something, I seldom hesitate to change it. Highlight, then Alt-Shift-R in Eclipse is all it takes.