Voucher Voided - Retainage not voided - batch out of balance.

My user had a voucher for $5000 with a retention of $500. When the voucher was voided, the GL entry for the void did not get written - only the reversing entry for the full amount of the voucher line, $5000. The F0411 has $4500, so the batch will not post due to being out of balance.

Is there a workaround to get that $500 credit in the F0911? Or am I stuck doing an insert via SQL? Is there a reason why the retention entry wasn't a part of the void?

Thanks!