Discrepancy between S_ALR_87012277 with FBL3N

Hi Experts,

I just do some checking between amount for one fiscal year with that two t-code but i found that there are discrepancy on total amount. I already ensure that both t-code are using the same parameter to retrieve the data. Then, I tried to get the transaction which reflected on S_ALR_87012277 with using FAGLB03 and compare for each line time and finally, I got the some G/L Account which cause that discrepancy. And the question is what is the next action that i must to do for made the amount similar? And what are the root causes for that?

Kindly advice

Thanks

Best Regards,

Surya Dharma