The public service broadcaster committed a "serious breach" of broadcasting rules by failing to disclose that the narrator of a programme about the Gaza conflict was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a significant failing in relation to accuracy".
The authority has instructed the corporation to air a peak-time announcement about its conclusions.
"As this represents a major infringement of our regulations, we are instructing the broadcaster to broadcast a message of our determinations against it on BBC Two at 9pm, with a schedule to be confirmed," the regulator stated.
'Possibility to Erode Confidence'
The watchdog's statement said: "Our probe concluded that the film's omission to reveal that the voice's father occupied a position in the Hamas-controlled administration was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been highly relevant to their judgment of the presenter and the content he shared.
"Credibility is at the center of the connection between a media organization and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the possibility to undermine the significantly high amounts of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in the month of February after the narrator's familial connections emerged, and in this past July an internal BBC review concluded it breached the organization's editorial guidelines on accuracy.
A corporation official commented: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in complete. We will adhere to the sanction as soon as the date and wording are finalised."
