The Danish prince was reportedly denied entry to a bar in Brisbane city, Australia, for lacking the required identity card, the local media reported.
The crown prince Frederik, 49 knows, and his entourage is rumored to be only able to enter the bar with the help of police officers for diplomatic protection.
Previously, they were asked to show the identity card to the doorman of the bar.
Queensland and other states in Australia apply strict rules to get into places that sell alcoholic beverages.
Often the late night bar visitors in Queensland must show passports or driver's licenses as proof of their identity as they enter places that remain open past midnight.
The state government said that the law passed last July was already in place 'to minimize the risk of alcohol-related hazards'.
Prince Frederik and his assistants are in Brisbane to take part in a sailing race, local media reported. They were only allowed to enter the bar after diplomatic staff intervened.
Bar owner Phil Hogan told the Brisbane Courier Mail newspaper that the new rule was a 'nightmare' and emphasized that prominent international figures must be excluded.
"The incident with the prince is just the tip of the iceberg, every time it happens with ordinary people," he said.