most likly u write something like
append '0COSTELMNT' to lt_itab.
append '0CO_AREA' to lt_itab
CALL METHOD cl_rstran_gen_step_hier_split=>reset_interval_nodes
EXPORTING
i_iobjnm = lt_itab
i_t_intervals = SOURCE_PACKAGE_5
CHANGING
c_t_nodes = SOURCE_PACKAGE_3.