If you're doing ongoing JE imports (and this isn't a go-live), there's not a good way to clear it unfortunately. You could assign some dummy customer/vendor to the AP & AR lines and then at least it wouldn't show up on your aging as "no customer/vendor" but I'm guessing it's still a balance you don't want? I've seen people just customize the aging reports to exclude the no customer/vendor. If you're doing a go-live (or you really want to clear this), you can bring in the actual invoices/bills that make up the balance and have the other side hit a clearing account. Assign some dummy customer/vendor to the JE AR/AP lines when you bring that in. Then post an adjusting entry (using your dummy customer/vendor) to clear your clearing account and get rid of the dupe AP/AR balance. You can apply the adjusting journal against your original import journal and the balance goes away.