Track General Ledger Changes

Hi,

I was hoping to get some assitance with a General Ledger report. 

I am currently producing a report for the previous FY and I was to see which user accounts made changes to the general ledger.

I couldn't see any customisation settings and wanted to know if there was any way to determine which specific usernames have made changes, additions etc. to the ledger. 

Thanks,

Nick.