If receiving full payment from customer, then clearing is ok, if partial, then need to clearing former bill and then create a new document with remained.
Accounting-Financial Accounting-Account receivable-Document entry-Incoming payment
When I do the F-28, no record open item exist, So I turn back and check what I did . only reason is when I create the invoice, I simulated and then I do the parked by myself, I am worrying about this, Maybe that is the key point I can get througt the process. So I back and do the invoice entry again.
1800000001 was create, same to the former invoice 1800000000. totally same.
Got it, that's it.
note: if we do the incoming payment process,F-28, first, don't park the invoice after entering -FB70. then it can be open items to do F-28.
Then go on.
According to the book, here shows after simulate or overview, there are two items about the document, But ONE Itmes in my case, I don't know why?
After saving, I enter into the Document display, and find that the document items are same the document overview of F-28, who knows, let it be.
All of the case I did just in accordance with the exercise, I need to check again.
Of course I can save the document, message shows: Document 1400000000 was posted in the company code D999