Hi Naveen,
" i am not posting data on SEP month logic data should be Q3 = SEP = JUL+ AUG but SEP = JUL+AUG is not working."
Incorrect idea!
If you don't post data to SEP - it means that SEP YTD value is Zero!
It means that accumulated value is zero at the end of SEP and at Q3.
Let's imagine you post YTD:
JUL AUG SEP Q3
XX 50 100 5 5
5 is a balance at the end of SEP and the same balance at Q3.
Vadim
P.S. Please talk to any finance person - he will explain you the difference between balance sheet and P&L accounts.