A prosecution by the CAA would be a criminal prosecution, but they would not be able to do it if it happened due to an error on a current chart of a type generally used for the purpose.
Normally, "getting sued" refers to a civil liability and I can't see how that would materialise. I suppose if you busted CAS and brought down an airliner, then the insurance co. which paid out to the victims could go after the chart publisher, but this is such a remote chance.