The BBC engaged in a "serious breach" of media regulations by not revealing that the voice of a film about Gaza was the child of a Hamas representative, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the BBC to air a prime-time announcement about its conclusions.
"As this represents a major infringement of our regulations, we are directing the corporation to broadcast a announcement of our determinations against it on BBC2 at 9pm, with a timing to be determined," the regulator stated.
'Risk to Erode Confidence'
The watchdog's report said: "The inquiry we conducted concluded that the documentary's omission to reveal that the voice's parent occupied a role in the Hamas-administered government was significantly deceptive.
"It meant that the audience did not have vital facts which may have been highly relevant to their assessment of the presenter and the content he presented.
"Credibility is at the center of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to undermine the exceptionally strong levels of confidence that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the BBC's streaming service in February after the boy's family links came to light, and in the month of July an internal BBC review found it violated the broadcaster's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in full. We will follow the penalty as soon as the schedule and language are determined."
