The BBC was found to have committed a "major breach" of media regulations by omitting to mention that the narrator of a documentary about the Gaza situation was the offspring of a Hamas official, according to UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The regulator has directed the BBC to air a prime-time statement about its conclusions.
"As this represents a serious breach of our code, we are instructing the BBC to broadcast a message of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be confirmed," the statement read.
'Possibility to Damage Credibility'
The authority's report declared: "The inquiry we conducted found that the film's lack of disclosure that the voice's parent served in a position in the Hamas-run authority was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been very significant to their evaluation of the presenter and the information he presented.
"Trust is at the core of the relationship between a television network and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the possibility to erode the exceptionally strong amounts of trust that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in last February after the boy's familial connections emerged, and in July an broadcaster's internal assessment determined it violated the broadcaster's editorial guidelines on accuracy.
A corporation official commented: "The Ofcom ruling is in accordance with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will follow the penalty as soon as the timing and wording are confirmed."
