When you post to a G/L account, the program creates a G/L entry, which you can see from the chart of accounts by clicking Account, Ledger Entries.
G/L entries can be created in the following ways: by posting a general journal; by posting a sales order, invoice or credit memo; by posting a purchase order, invoice or credit memo; by posting cash receipts and payments to vendors; by posting finance charge memos and reminders and by running batch jobs.
You cannot change the contents of the fields in the G/L Entry table because the entries have been posted.