removed voucher from invoice approval journal gone wrong

I have an odd problem that I can’t find a resolution on by myself. My client has an AX2012 installation that appears to have “lost” 2 AP invoices.

The user have registered the invoice as usual and then created an invoice approval journal. Apparently something was wrong as they removed the voucher from the journal. So far so good but now they can’t find the invoice in the invoice pool anymore. If I look at the transaction for the vendor I can find the invoice and see that it is still not approved but it still won’t appear to be fetched to a new journal.

Apparently something must have gone wrong when they removed the invoice, i.e. an underlying table that doesn’t have the right status or something like that but I can’t figure out what or where

Does anyone have any suggestion how to solve this?