How to De-Activate a Service Subscription

Hi,

I have created on Service subscription for a project and then later i realized the amount is wrong and then i created new subscription for same project with correct amounts.

Now my problem is when i run invoice proposal both first subscription(Wrong) and second subscriptions(Right) are coming in the lines. I don't want the wrong subscription lines to come in my invoice proposal. How can i deactivate the wrong subscription. I cannot delete the wrong subscription as there are already posted fee transactions.

Thanks,

Samanth