How can a buyer change the late shipping answer were the feedback is positive?

[arteis]

I got a late shipping report on an item that the buyer left a positive feedback including "card came quickly".

I've send him a message asking him if the card came quickly or if it was late shipped.

He confirmed that he was satisfied with the delivery and want to remove the late shipping report.

I though I could do a request or feedback change but I cannot because the feedback is positive!?!

Is there a way?

And that idea that a feedback stating the delivery was good would prevent a late shipping report, is it a myth?

Again, like most of my problems, the issue come from Ebay.

Me and the buyer are both working together to try to fix what Ebay has done and situation like this happen way too often for the goodness of Ebay's reputation in buyers mind.