Mismatch between FI-PCA KE5T, missing entries in PCA due to missing cost element

Dear Experts,

Unfortunately we have a mismatch between FI-PCA, as the cost element was missing in CO (there was no cost element created for this account) a view invoices have been posted without any cost object (as mentioned above - furthermore the cost element was not available in CO), therefore are missing in PCA.

Is there any simple solution without reposting in FI (books are already closed). I tried 9KE0 but this transcation code requires an accounting balance of zero (reposting). What about 1KE8? Or maybe you can offer me any other solution.

Kind regards,

Nadine