This was a Designated worktag created as a Suspense account of sorts.
The team is using this to set up CC in Adaptive (penny in, penny out). In this case, you shouldn’t see any total amount in this Account Certification because the money was moved back out.
In some cases, charges that weren’t mapped to other worktags were charged to the DN99999 suspense account. Central Finance is working on moving some of these charges, so it is best if you have any of these types of charges on a DN99999 account to send an email to AskFinance to make sure that someone isn’t working on correcting this for you.