Hello Lalit,
Sorry for the late reply, busy lately.
After finishing LT2 process, use this code in flow:
/scwm/cl_rf_bll_srvc=>set_fcode( /scwm/cl_rf_bll_srvc=>c_fcode_compl_ltrans ).
This will close transaction, hopefully LT2 not LT1.
If this does not help, i suggest using parent transactions. See my attached pic(prepared by perfect paint skillz 
).
Best regards
Serhan