Yes, As Moff has said, if you have your compatible set to 8.0.3 when you have installed 8.0.4, and try to utilize a feature that is available in 8.0.4 but not 8.0.3, you will get an error. You can easily fix this error by editing the parameter in init.ora file and rebooting the database. However, it is always good practice to keep the compatible parameter up to date with the version and patches you have installed.