Client: The invoice you’ve sent me is wrong.
Me: Ok, I’m looking at my copy. What’s the problem?
Client: It doesn’t include the payments I’ve made.
Me: I don’t see any record of payment being received here. When did you make the payment and how did you pay?
Client: I wrote a cheque this morning.
Me: That you haven’t posted yet?
Client: Exactly, so why isn’t it on the invoice?