The British broadcaster engaged in a "major breach" of industry standards by not revealing that the narrator of a film about Gaza was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
The regulator has ordered the corporation to broadcast a evening statement about its findings.
"As this represents a major infringement of our regulations, we are directing the broadcaster to transmit a message of our conclusions against it on BBC2 at 9pm, with a schedule to be confirmed," the regulator stated.
'Risk to Erode Confidence'
The authority's announcement declared: "The inquiry we conducted concluded that the film's failure to disclose that the narrator's father served in a role in the Hamas-run authority was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been very significant to their judgment of the presenter and the information he presented.
"Trust is at the heart of the relationship between a broadcaster and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to undermine the significantly high levels of credibility that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from the online platform in February after the presenter's family links came to light, and in July an broadcaster's internal assessment concluded it violated the corporation's journalistic standards on factual correctness.
A corporation official said: "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 corporation's content standards on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the authority's determination in full. We will comply with the penalty as soon as the timing and language are finalised."
