Hi
Please check the following link:
http://help.sap.com/saphelp_nw04/helpdata/en/37/a2e3ba344411d3acb00000e83539c3/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/en/d3/43d2416d9c1c7be10000000a1550b0/frameset.htm
http://sap.ittoolbox.com/groups/technical-functional/sap-basis/lock-table-overflow-506470
....
Mutti