Difference in Excise Duty Payable G/L in F.01 & FBL3N

Dear Experts,

We are facing some difference in G/L Account of Excise Duty Payable between F.01 & FBL3N (G/L Line Item Display)as on 31st March 2012. When we check the balance in FBL3n it shows Nil balance but in F.01 it shows the balance of Rs.5,00,000. When I compare the balance in FAGLB03 with F.01 it matches the figure of Balance Sheet. Even the amount displayed in F.01 is getting tallied with S_ALR_87012277 & also closing balance & opening is also properly carried forward. Our client is in ECC 5.0.Can anyone guide us why Excise Duty Payable G/L shows zero balance in FBL3N.

Kindly help us to resolve the issue asap.

Thanks & Regards,

Nazia