Can't Change Return. TurboTax doesn't recognize return has already been filed with netfile.

I filed using netfile and have received my NOA. I now need to make an adjustment as I received additional tax slips. However, when i select the change a filed return option I get the error message "We are unable to make changes to your completed return because the return has not been electronically submitted to the CRA/RQ with Netfile". How can I fix this? Should I file again using the Netfile option?