Line and distribution amount is not matched in AP invoice?

Hi,
I create an invoice ,but when i am going to cancel the invoice,it message me 'The invoice cannot be fully cancelled' I check the distribution there is line and distribution amount is not matched.and the accounting status is partial.Hold also shows line and distribution amount is not matched.

How i can match the line and distribution amount to cancel the invoice?because it doesnt allow me to enter distribution amount.It is freeze