The public service broadcaster committed a "significant breach" of media regulations by failing to disclose that the narrator of a programme about Gaza was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
The authority has instructed the corporation to transmit a peak-time declaration about its conclusions.
"As this represents a significant violation of our code, we are ordering the corporation to transmit a statement of our conclusions against it on BBC2 at 9pm, with a date to be finalised," it said.
'Potential to Erode Credibility'
The regulator's statement stated: "Our probe concluded that the film's omission to reveal that the voice's parent served in a post in the Hamas-administered government was materially misleading.
"Consequently that the audience did not have critical information which may have been very significant to their judgment of the presenter and the details he presented.
"Confidence is at the core of the relationship between a television network and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to undermine the significantly high levels of credibility that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the online platform in February after the narrator's personal associations came to light, and in this past July an broadcaster's internal assessment concluded it violated the corporation's content policies on accuracy.
A BBC spokesperson said: "The authority's determination is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in full. We will adhere to the penalty as soon as the date and wording are finalised."
