The below link should clear your doubts.
http://help.sap.com/saphelp_470/helpdata/en/75/ee104955c811d189900000e8322d00/content.htm
The below link should clear your doubts.
http://help.sap.com/saphelp_470/helpdata/en/75/ee104955c811d189900000e8322d00/content.htm