The public service broadcaster engaged in a "significant breach" of broadcasting rules by not revealing that the narrator of a film about the Gaza conflict was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The regulator has instructed the corporation to air a peak-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are directing the corporation to transmit a statement of our determinations against it on the BBC's second channel at 9pm, with a date to be confirmed," the regulator stated.
'Possibility to Undermine Confidence'
The authority's announcement said: "The inquiry we conducted concluded that the documentary's lack of disclosure that the narrator's father held a post in the Hamas-run administration was significantly deceptive.
"Consequently that the public did not have vital facts which may have been very significant to their assessment of the presenter and the details he shared.
"Trust is at the center of the connection between a broadcaster and its viewers, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the risk to erode the exceptionally strong levels of credibility that audiences would have invested in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in February after the narrator's familial connections emerged, and in July an corporation's own inquiry determined it breached the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will comply with the directive as soon as the date and wording are determined."
