The public service broadcaster committed a "serious breach" of broadcasting rules by not revealing that the voice of a film about the Gaza conflict was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The authority has instructed the BBC to air a peak-time declaration about its conclusions.
"Given this constitutes a major infringement of our regulations, we are directing the corporation to transmit a announcement of our findings against it on BBC Two at 21:00, with a date to be finalised," the regulator stated.
'Possibility to Erode Confidence'
The authority's report declared: "The inquiry we conducted concluded that the film's failure to disclose that the presenter's father occupied a post in the Hamas-run administration was materially misleading.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the content he shared.
"Confidence is at the center of the bond between a television network and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to erode the exceptionally strong degrees of confidence that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from the online platform in February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment found it breached the broadcaster's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in complete. We will adhere to the sanction as soon as the date and wording are determined."
