There may be some other hidden issues. For example, if you have an AP vendor set up for auto-distribute & you delete the system account for this, you get no warning. Then you can voucher against this account, post the AP transactions w/o warning & the distribution will be empty. There may be other places the account is stored that may be adversely affected by deleting them. You'd need to review all files that use account number & be sure all references were gone. If it is in the comparative file, you should not remove it. If you do & you run comparative statements for that year, your financial statements will not balance. Maybe you should entitle the account "DO NOT USE" until you can research if it doesn't exist anywhere. You can also think about the mass gl change/merge utility available from ACSI.