Hi Kaushik,
Please change iv_all_rows_editable = 'X' instead of space. Then it should work fine even i faced this issue. if you pass iv_all_rows_editable = 'X' it should work.
cl_thtmlb_util=>translate_selection_mode(
exporting
iv_selection_mode = ERPBILLPLANI->SELECTION_MODE
iv_all_rows_editable = 'X'
importing
ev_selection_mode = lv_cellerator_selectionmode
ev_edit_mode = lv_cellerator_editmode
ev_selection_column = lv_cellerator_selectioncolumn ).
Regards,
Deepika C.