The British broadcaster was found to have committed a "major breach" of media regulations by failing to disclose that the presenter of a film about Gaza was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
The regulator has instructed the corporation to transmit a prime-time declaration about its findings.
"As this represents a major infringement of our code, we are instructing the corporation to air a message of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be finalised," it said.
'Possibility to Undermine Confidence'
The watchdog's announcement declared: "The inquiry we conducted found that the film's omission to reveal that the voice's parent served in a role in the Hamas-administered authority was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the voice and the content he provided.
"Confidence is at the center of the bond between a media organization and its audience, especially for a national broadcasting corporation such as the BBC.
"This error had the risk to undermine the exceptionally strong amounts of credibility that viewers would have invested in a BBC factual programme about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in the month of February after the narrator's familial connections were revealed, and in the month of July an corporation's own inquiry concluded it breached the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will comply with the directive as soon as the timing and language are finalised."
