The BBC engaged in a "significant breach" of broadcasting rules by failing to disclose that the narrator of a programme about the Gaza situation was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
Ofcom has instructed the broadcaster to broadcast a evening declaration about its conclusions.
"Since this amounts to a serious breach of our code, we are instructing the corporation to broadcast a announcement of our determinations against it on BBC2 at 21:00, with a schedule to be finalised," the regulator stated.
'Risk to Undermine Credibility'
The regulator's announcement declared: "The inquiry we conducted concluded that the film's omission to reveal that the voice's parent served in a role in the Hamas-run authority was significantly deceptive.
"Consequently that the audience did not have essential details which may have been very significant to their assessment of the presenter and the information he presented.
"Confidence is at the heart of the connection between a television network and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the possibility to erode the exceptionally strong amounts of confidence that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was removed from iPlayer in last February after the boy's personal associations came to light, and in July an corporation's own inquiry determined it violated the corporation's content policies on accuracy.
A BBC spokesperson said: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will follow the directive as soon as the timing and wording are determined."
