Queensland's Attorney-General has stood by the state's controversial ID scanning laws, saying "rules are rules", after reports Denmark's Crown Prince Frederik was denied entry to a Brisbane bar at the weekend.

But a spokeswoman for Attorney-General Yvette D'Ath denied that liquor office bureaucrats were called on to eventually help get the Danish royal into the upmarket bar and restaurant fronting the Brisbane River.

"The Office of Liquor and Gaming Regulation has no knowledge or notification of this incident occurring," she said.

Early July marked the introduction of the Queensland government's ID scanning laws, forcing all patrons to provide ID to enter all late-night licensed venues in Safe Night Precincts across the state.