Credit Bill Accounting Errors - Need to Cancel Credit Bill

Hello,

We have a weird scenario and wondering if there is a online fix or process to correct this error besides using a SQL update.  We have a credit bill that was invoiced against a project thatwas cancelled and has a billing status of invoiced.  It will not post due to the accounting errors and our GL group does not want to allow charges to this project.  We cannot correct the accounting because this is a credit bill and needs to reference the original accounting used.  Is there a way to cancel the credit invoice even though the status shows invoiced