Instead of cancelling a media campaign or a campaign item within the campaign you also have the option to cancel just one invoice or invoice item:
What happens is that the
This PreInvoice has to still go through the regular billing run.
Open the related list of Invoice Items for your Invoice in View All mode:
Click on the item you like to cancel and then hit the Cancel Item Button. You will receive a success or error message. Then open the media campaign to view the newly created preinvoice for this one item:
Next, continue with the 6.2 Billing Run