This is a good SAP FICO Accounts receivables tutorial that I usually refer to. Any transaction codes with starting with Z are not of use since they maybe specific to the company. I would suggest a newcomer to first understand the following transaction of this tutorial first and then move to other details.
- Create Customer Invoice FB70
- Booking Customer Invoices F-22
- Incoming customer payment F028
- Clearing Open Line items in the GL Account F-03
- Refund of Advance to Customer F-31/F-18
- Clear Customer Invoice with Advances F-32
- Reversal of Noted Entries FB08
