The public service broadcaster was found to have committed a "significant breach" of media regulations by not revealing that the presenter of a programme about the Gaza situation was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
The authority has ordered the BBC to air a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our rules, we are instructing the corporation to broadcast a message of our findings against it on BBC2 at 9pm, with a schedule to be finalised," the statement read.
'Potential to Undermine Confidence'
The authority's report said: "Our probe concluded that the film's lack of disclosure that the voice's father served in a post in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the details he shared.
"Confidence is at the core of the connection between a television network and its audience, especially for a national broadcasting corporation such as the BBC.
"This failing had the possibility to erode the very considerable degrees of confidence that viewers would have invested 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 family links were revealed, and in the month of July an corporation's own inquiry determined it breached the broadcaster's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will adhere to the directive as soon as the date and wording are finalised."
