The BBC was found to have committed a "major breach" of media regulations by not revealing that the narrator of a documentary about the Gaza situation was the son of a Hamas official, as determined by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The authority has instructed the broadcaster to broadcast a prime-time statement about its findings.
"As this represents a major infringement of our code, we are ordering the BBC to air a statement of our conclusions against it on BBC Two at 21:00, with a date to be confirmed," it said.
'Risk to Undermine Credibility'
The authority's announcement said: "The inquiry we conducted concluded that the film's omission to reveal that the presenter's male guardian served in a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the audience did not have vital facts which may have been highly relevant to their evaluation of the voice and the content he shared.
"Confidence is at the core of the relationship between a media organization and its viewers, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the possibility to undermine the exceptionally strong levels of confidence that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in February after the boy's familial connections came to light, and in July an corporation's own inquiry found it infringed the organization's journalistic standards on accuracy.
A BBC spokesperson stated: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will follow the sanction as soon as the timing and language are finalised."
