The public service broadcaster was found to have committed a "major breach" of media regulations by failing to disclose that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The authority has ordered the BBC to broadcast a peak-time statement about its conclusions.
"Given this constitutes a significant violation of our rules, we are instructing the corporation to transmit a announcement of our determinations against it on BBC Two at 9pm, with a date to be finalised," the regulator stated.
'Potential to Erode Confidence'
The regulator's statement declared: "The inquiry we conducted determined that the film's failure to disclose that the voice's parent held a post in the Hamas-run authority was significantly deceptive.
"This implied that the public did not have essential details which may have been very significant to their judgment of the presenter and the details he presented.
"Trust is at the core of the relationship between a television network and its public, particularly for a state-funded media outlet such as the BBC.
"This failing had the possibility to damage the very considerable amounts of credibility that the public would have put in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in last February after the narrator's familial connections came to light, and in July an broadcaster's internal assessment found it violated the organization's journalistic standards on truthfulness.
A BBC spokesperson said: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to 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 penalty as soon as the schedule and wording are finalised."
