The BBC committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a documentary about Gaza was the child of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a significant failing in relation to truthfulness".
The regulator has instructed the corporation to transmit a peak-time statement about its conclusions.
"As this represents a serious breach of our rules, we are instructing the corporation to air a statement of our conclusions against it on BBC Two at 9pm, with a date to be confirmed," the regulator stated.
'Potential to Erode Confidence'
The regulator's statement said: "Our probe determined that the film's omission to reveal that the narrator's male guardian held a role in the Hamas-administered government was significantly deceptive.
"Consequently that the audience did not have critical information which may have been very significant to their judgment of the voice and the details he shared.
"Credibility is at the heart of the relationship between a broadcaster and its audience, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the risk to erode the significantly high levels of confidence that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in February after the presenter's familial connections emerged, and in the month of July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in full. We will comply with the sanction as soon as the date and wording are determined."
