The BBC committed a "significant breach" of media regulations by failing to disclose that the narrator of a programme about the Gaza situation was the child of a Hamas representative, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a major oversight in relation to accuracy".
The regulator has directed the BBC to transmit a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our regulations, we are ordering the broadcaster to transmit a message of our determinations against it on BBC2 at 9pm, with a timing to be confirmed," the statement read.
'Potential to Damage Credibility'
The regulator's statement said: "Our probe concluded that the film's omission to reveal that the voice's parent occupied a role in the Hamas-administered authority was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their assessment of the narrator and the content he shared.
"Credibility is at the heart of the relationship between a media organization and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the exceptionally strong amounts of trust that audiences would have put in a BBC factual programme about the Gaza conflict."
The film was pulled from the BBC's streaming service in last February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment concluded it breached the organization's journalistic standards on accuracy.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in full. We will follow the directive as soon as the date and wording are finalised."
