The BBC was found to have committed a "major breach" of industry standards by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas representative, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to factual correctness".
The regulator has ordered the BBC to air a peak-time statement about its findings.
"Given this constitutes a significant violation of our code, we are directing the BBC to air a announcement of our determinations against it on BBC2 at 9pm, with a date to be finalised," the regulator stated.
'Potential to Undermine Confidence'
The watchdog's statement said: "The inquiry we conducted determined that the film's failure to disclose that the narrator's parent served in a position in the Hamas-administered authority was significantly deceptive.
"It meant that the audience did not have vital facts which may have been highly relevant to their evaluation of the presenter and the details he shared.
"Trust is at the center of the connection between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the exceptionally strong amounts of confidence that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from iPlayer in February after the presenter's familial connections emerged, and in the month of July an internal BBC review concluded it infringed the broadcaster's journalistic standards on accuracy.
A corporation official commented: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"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 timing and wording are confirmed."
