QuickBooks: How Documents Post
A bill
A vendor emails an invoice. This is everything between that email and an open bill in QuickBooks.
A receipt
A receipt is not a bill: nothing is owed, the money already moved. The question is which transaction already in your books it belongs to.
A credit memo
A vendor credits you for a return or an overcharge. Nothing is owed and nothing is scheduled — it is coded and posted the same way a bill is.
