PLlease see this link:-
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3c60358411d1829f0000e829fbfe/content.htm
locate the program
REPORT demo_data_ext_cluster_open_1.
there is a statement
srtf2 = 0
the explanation is although given----but my question is how is that achieved & why it happens?