SAP Special Fields in FAGLL03 transaction

https://wiki.scn.sap.com/wiki/display/ERPFI/Special+Fields+in+FAGLL03+transaction

https://wiki.scn.sap.com/wiki/display/ERPFI/Special+Fields+in+FBL*N+transactions

http://blog.itpub.net/10350860/viewspace-677302