Hi,
DATA: lo_bol_core TYPE REF TO cl_crm_bol_core,
lt_params TYPE crmt_name_value_pair_tab,
lo_bol_col TYPE REF TO if_bol_bo_col.
lo_bol_core = cl_crm_bol_core=>get_instance( ).
lo_bol_col = lo_bol_core->root_create( iv_object_name = 'ZAET_CA_ATAB000000'
iv_create_param = lt_params
iv_number = 1 ).
lr_leading_entity= lo_bol_col->get_first( ).
Like this you can create root entity.
Regards,
Deepika