Accounts Receivable and Accounts Payable:
FI Accounts Receivable and Accounts Payable
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/FIBP/FIBP.pdf
FI/SD - Credit Management/Risk Management
Advance Payments
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PYINT/PYSOME_ADVANCE.pdf
Funds Management
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/FIFM/FIFM.pdf
Payments
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/FIBP/FI-AP-AP-PT.pdf
Payment Program for Payment Requests (FI-BL)
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/TRZP/TRZP.pdf
Payment Release
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/FIBP/FI-AP-AP-RP.pdf
SAP FICO Material For Free
I have posted links for SAP FICO Material. Download it for Free.