The British broadcaster engaged in a "major breach" of industry standards by failing to disclose that the voice of a film about the Gaza conflict was the child of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the broadcaster to broadcast a evening declaration about its findings.
"As this represents a major infringement of our code, we are ordering the broadcaster to air a statement of our determinations against it on BBC Two at 9pm, with a date to be finalised," it said.
'Risk to Damage Trust'
The authority's announcement stated: "The inquiry we conducted found that the film's omission to reveal that the narrator's parent held a role in the Hamas-run government was substantially inaccurate.
"It meant that the audience did not have critical information which may have been very significant to their judgment of the narrator and the content he shared.
"Credibility is at the center of the relationship between a television network and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to damage the very considerable levels of trust that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the online platform in last February after the narrator's personal associations came to light, and in this past July an broadcaster's internal assessment found it infringed the broadcaster's content policies on accuracy.
A corporation official stated: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the authority's determination in full. We will adhere to the sanction as soon as the date and language are determined."
