The phrase "a formal warning from" is correct and usable in written English.
It can be used when referring to an official notification or reprimand issued by an authority or organization.
Example: "After several infractions, the employee received a formal warning from the management regarding their conduct."
Alternatives: "an official notice from" or "a written reprimand from".
For that he received a formal warning from the ARU.
The final step - suspending voting rights - has already been ruled out, as Hungary has vowed to veto the decision, but Brussels insiders think even a formal warning from a majority of other member states would have an effect.
In a statement, World Snooker said: "Ronnie O'Sullivan has received a formal warning from World Snooker following his failure to fulfil media obligations at the Betfred World Championship on Monday.
Despite the jokes – when he and Michael Bentine created a special effect apparently blasting the BBC into space, Moore got a formal warning from the director general's office ("Television Centre is not to be used for the purposes of entertainment") – Lord Rees praised the range and seriousness of his mind.
The vast majority of those received a formal warning from police about their conduct, following an admission of guilt.
The park has already received a formal warning from the Environment Agency but now wants planning permission for a multimillion-pound expansion to build more lodges.
Mourinho was issued with a formal warning for comments ahead of Chelsea's 2-0 win at Stoke on 22 December.
Two months after that, he was fined £100,000 and given a formal warning for headbutting Hull City midfielder David Meyler.
Barclays, which is contesting the allegations, cites a "formal warning" notice from the FCA which has warned the bank that it "acted recklessly" in the way it disclosed the information about the fees and in so doing breached some of the rules governing the way shares are listed on the stock exchange.
Penalties range from a formal warning to expulsion.
The committee could recommend responses from a formal warning to dismissal.
