Line discared bymistake on paid invoice

Hello,

User have created one invoice with PO and  paid. By mistake he click on DISCARDED LINE instead of DISTRIBUTIONS button. Now line discared and status as NEEDS REVALIDATION and stuck with hold due to mismatch between header amount and line amount.

It's not allowing to add lines manually. how can we resolve this issue without cancellation of payment.

Regards,

Madhu