The public service broadcaster engaged in a "major breach" of industry standards by failing to disclose that the narrator of a film about Gaza was the child of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The regulator has instructed the corporation to broadcast a evening declaration about its conclusions.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be determined," it said.
'Possibility to Erode Confidence'
The authority's statement stated: "The inquiry we conducted determined that the film's failure to disclose that the narrator's male guardian held a role in the Hamas-controlled government was materially misleading.
"This implied that the public did not have essential details which may have been very significant to their evaluation of the voice and the details he presented.
"Confidence is at the heart of the connection between a broadcaster and its audience, particularly for a state-funded media outlet such as the BBC.
"This failing had the possibility to damage the significantly high levels of trust that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from the BBC's streaming service in February after the presenter's family links emerged, and in the month of July an corporation's own inquiry concluded it breached the corporation's content policies on factual correctness.
A representative for the broadcaster said: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in full. We will follow the directive as soon as the schedule and language are confirmed."
