The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a significant failing in relation to accuracy".
The authority has ordered the BBC to air a prime-time statement about its decisions.
"As this represents a serious breach of our rules, we are ordering the corporation to broadcast a announcement of our findings against it on BBC2 at 21:00, with a schedule to be confirmed," it said.
'Risk to Damage Credibility'
The watchdog's report said: "Our investigation determined that the film's omission to reveal that the narrator's father served in a post in the Hamas-run government was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been very significant to their assessment of the voice and the information he provided.
"Credibility is at the heart of the bond between a broadcaster and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This failing had the risk to damage the very considerable degrees of credibility that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the boy's family links emerged, and in this past July an internal BBC review determined it violated the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster said: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in full. We will follow the penalty as soon as the date and language are determined."
