The BBC engaged in a "major breach" of broadcasting rules by not revealing that the narrator of a documentary about Gaza was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to accuracy".
The authority has instructed the corporation to transmit a prime-time declaration about its findings.
"As this represents a significant violation of our code, we are instructing the corporation to air a message of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The authority's statement stated: "The inquiry we conducted found that the documentary's omission to reveal that the presenter's father occupied a position in the Hamas-run government was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their judgment of the voice and the information he provided.
"Confidence is at the core of the connection between a television network and its public, especially for a public service broadcaster such as the BBC.
"This error had the risk to erode the significantly high amounts of credibility that audiences would have put in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the online platform in February after the boy's personal associations were revealed, and in July an broadcaster's internal assessment found it breached the broadcaster's journalistic standards on factual correctness.
A corporation official said: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in full. We will adhere to the directive as soon as the schedule and wording are finalised."
