If the pre-validation service returns errors, you will see a red sad face and a message explaining the error.
The service returns any errors that will prevent filing the T2 return once complete. It also provides some basic instructions on how to correct the errors. For example, if a corporation’s name is incorrect, this service will indicate that the name does not match the CRA’s records.
After correcting the issue in the file, you can run the pre-validation again.