The public service broadcaster engaged in a "major breach" of media regulations by not revealing that the narrator of a film about Gaza was the child of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
The authority has directed the broadcaster to transmit a prime-time announcement about its conclusions.
"As this represents a serious breach of our regulations, we are instructing the broadcaster to transmit a statement of our determinations against it on BBC2 at 9pm, with a schedule to be determined," it said.
'Risk to Damage Trust'
The authority's statement stated: "Our investigation found that the film's failure to disclose that the narrator's father held a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their evaluation of the presenter and the content he shared.
"Confidence is at the center of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to erode the very considerable levels of trust that the public would have placed in a BBC factual programme about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in the month of February after the narrator's family links came to light, and in the month of July an broadcaster's internal assessment found it infringed the corporation's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in complete. We will adhere to the directive as soon as the date and language are determined."
