The public service broadcaster engaged in a "significant breach" of industry standards by omitting to mention that the narrator of a programme about Gaza was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, noting there had been "a serious error in relation to factual correctness".
The regulator has directed the corporation to transmit a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our code, we are ordering the BBC to broadcast a message of our determinations against it on BBC Two at 21:00, with a schedule to be finalised," it said.
'Possibility to Erode Credibility'
The authority's statement declared: "Our probe determined that the film's omission to reveal that the voice's parent occupied a post in the Hamas-controlled authority was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the information he shared.
"Credibility is at the heart of the bond between a television network and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to undermine the exceptionally strong levels of credibility that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from the BBC's streaming service in February after the presenter's personal associations were revealed, and in the month of July an internal BBC review determined it infringed the organization's editorial guidelines on truthfulness.
A corporation official commented: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the regulator's ruling in full. We will adhere to the sanction as soon as the schedule and wording are finalised."
