The BBC engaged in a "major breach" of industry standards by not revealing that the voice of a programme about Gaza was the child of a Hamas administrator, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a significant failing in relation to factual correctness".
The authority has ordered the BBC to broadcast a peak-time declaration about its decisions.
"As this represents a significant violation of our regulations, we are directing the broadcaster to broadcast a message of our findings against it on BBC2 at nine o'clock in the evening, with a date to be determined," the statement read.
'Possibility to Erode Confidence'
The watchdog's announcement declared: "Our probe concluded that the programme's lack of disclosure that the presenter's male guardian held a position in the Hamas-run authority was materially misleading.
"This implied that the public did not have essential details which may have been very significant to their judgment of the narrator and the details he shared.
"Credibility is at the core of the connection between a broadcaster and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to undermine the exceptionally strong degrees of confidence that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the boy's familial connections emerged, and in July an internal BBC review found it violated the broadcaster's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in accordance with the findings of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in full. We will follow the directive as soon as the date and wording are finalised."
