HI,
The Parameter : I_ROLLUP_ONLY is define with a default value RS_C_TRUE. The data object of default value is constants. The value of a constant cannot be changed during the execution of the program. If you try to change the value of a constant, a syntax error or runtime error occurs.
That is why you are getting same results.
Please go through the following links.
https://help.sap.com/saphelp_nw70/helpdata/en/fc/eb3041358411d1829f0000e829fbfe/content.htm
Regards,
Anand Kumar