I've had this once before, and it baffles me.
Last time a customer prepaid £10 towards the next clean, so I typed in my PDA extension, 'Paid' £20. So did the customer yesterday again, and in my PDA it said, owed to customer : £10 (or something along those lines), so I thought, okay that's great, I'll tick that I did the clean, didn't tick payment received, because she prepaid it already.
So I open George, and that customer owes me £10 it says, on my debt list, which is weird. So ticked the paid box, so now in my main list on my PC, it says in Balance -£10.
Now if I check all the history on that customer, in the history box, I can nowhere find the £20 prepaid, so the balance should be £0, and all the entries show that they have been paid?!
This is seriously confusing, I'm not sure I understand it myself! This happened before, and eventually, somehow the problem solved itself on the next clean.