Difference in total - F.01 and FAGLB03

Hi Experts,

We have got all our financial data from Legacy to SAP system. After it is brought into SAP we executed transaction FPg4 and FPG1M to move everything to FI-GL

Transfer process was successfull, but here is the problem

for one of the G/L accounts we are finding different balances in transaction f.01 and FAGLB03.

Anybody knows what is the best way to track downt this? I want to fine root cause of this difference.

Thanks,

Suhas.