Directive/2004/38/EC wrote:
Entering Ireland without having the required visa may result in them giving you a "visa warning". I doubt such a warning has much effect for the family member of an EU citizen, but it makes them happy to have done it. I can't see that it is illegal in itself.
Mike
I do think it is unlawful for one to be given a warning for doing something which is not considered wrong, or is within their rights.
There are implications for the holder of the passport on which the warning is endorsed. It will make it difficult for them to obtain a visa when traveling to areas outside the community. As narrow minded countries may consider them as illegal entrant or may be thinking that the individual may intend to violate their immigration rules.
There is a tendency that an entry clearance officer or an immigration officer may consider this to be an immigration violation, when it is not. They may be ignorant of the EU regulations.
If this warning was given in writing on a piece of paper, i will have little or no problem with it.
I personally think it should be appealed.