The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the child of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The regulator has ordered the BBC to broadcast a prime-time declaration about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to air a statement of our determinations against it on BBC2 at 21:00, with a date to be confirmed," it said.
The watchdog's announcement declared: "The inquiry we conducted found that the documentary's failure to disclose that the voice's male guardian occupied a post in the Hamas-run authority was materially misleading.
"Consequently that the public did not have essential details which may have been extremely pertinent to their judgment of the narrator and the content he shared.
"Confidence is at the heart of the bond between a television network and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high amounts of credibility that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in last February after the boy's family links emerged, and in this past July an broadcaster's internal assessment found it infringed the organization's editorial guidelines on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the results of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and wording are determined."
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