The public service broadcaster engaged in a "significant breach" of media regulations by failing to disclose that the presenter of a film about Gaza was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has directed the BBC to broadcast a prime-time declaration about its conclusions.
"Given this constitutes a serious breach of our regulations, we are instructing the corporation to broadcast a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Risk to Damage Credibility'
The authority's announcement stated: "Our probe concluded that the documentary's lack of disclosure that the narrator's parent served in a post in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the presenter and the content he provided.
"Confidence is at the heart of the bond between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to erode the exceptionally strong degrees of credibility that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was withdrawn from iPlayer in the month of February after the narrator's familial connections were revealed, and in this past July an broadcaster's internal assessment found it breached the organization's journalistic standards on truthfulness.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in full. We will follow the directive as soon as the schedule and wording are confirmed."
