The phrase "a written warning that" is correct and usable in written English.
You can use it when referring to a formal notification or reprimand that is documented in writing.
Example: "The employee received a written warning that outlined the consequences of their repeated tardiness."
Alternatives: "a formal notice that" or "a documented reprimand that".
It makes more sense to monitor the individual for a period of time, documenting all cases of incorrect activity, in order to build a bigger case before issuing a written warning that goes directly into the employee's record.
You goal is to help the person understand the impact of their behavior and the consequences of what will happen if their bad behavior continues (such as a written warning that will go into their personnel file, demotion, loss of job, etc.).
During the two years before the disastrous opening of HealthCare.gov, federal officials in charge of creating the online insurance marketplace received 18 written warnings that the mammoth project was mismanaged and off course but never considered postponing its launch, according to government investigators.
The letter, addressed to the group editor Tim Jones, says that he received "a written warning" after informing his line boss that he needed to attend a hospital appointment with his grandmother.
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Failure to meet these requirements results in corrective measures that may include a written warning, academic probation, and/or the possible release from the program.
Other penalties can include a written warning, a final written warning or dismissal with contractual notice.
It's understood that Horton has received a written warning from Lancashire constabulary on this count.
Apple has so far given a written warning to developers, urging them to stopping using services that guarantee top placement.
Kawaguchi was given a written warning, and as a result was inadvertently pushed to the forefront of one of Japan's longest-running and most bizarre legal rows.
