I am not a tax expert (or TurboTax expert) but I would probably recommend against doing this (clearing the form and filing).
In my case the data on the T657 is from previous years (1999 capital loss that has not been claimed yet) and it is carried over each year until I can use it to reduce gains in taxable accounts (right now all my gains are in registered accounts (TFSA, RRSP, RIF) so I am not using it). Clearing the form and filing MAY result in the amounts not being carried over in future years when using TurboTax, so you'd have to somehow restore the amounts manually.
But I am not sure if that is the case (someone from Intuit would need to chime in).
For now I will wait for the T657 to unlock (hopefully SOON !!!)
