TT600 means that something has been input that TurboTax
cannot understand or has not been programmed to accept. If you are trying to
put in your industry code, try searching for it using this link, and then just
type the number that you found into the program. https://www.statcan.gc.ca/eng/subjects/standard/naics/2017/v3/index
TT600 error FAQ: https://turbotax.community.intuit.ca/replies/2647802
