1grn with 2 invoices, first invoices posted as final. need correction

I had 1 GRN for a Purchas order with two invoices. When i posted first invoice mistakenly changed the line qunatity and invoiced without product match means as final. Now for the remaining quantity i could not invoice it. How can i solve it or any best solution pls from experts. Ex - GRN 25 quantity and Invoice 1 Posted with 15 as final and for remaining 10 quantity could not post now.
Thank you