The BBC engaged in a "serious breach" of industry standards by failing to disclose that the presenter of a film about the Gaza conflict was the child of a Hamas representative, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a serious error in relation to truthfulness".
The authority has directed the BBC to broadcast a evening announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are directing the corporation to broadcast a statement of our determinations against it on the BBC's second channel at 9pm, with a schedule to be determined," it said.
'Possibility to Damage Confidence'
The authority's announcement said: "Our investigation found that the programme's omission to reveal that the voice's male guardian occupied a position in the Hamas-run administration was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been very significant to their evaluation of the narrator and the content he shared.
"Credibility is at the core of the connection between a broadcaster and its audience, notably for a public service broadcaster such as the public broadcaster.
"This error had the possibility to undermine the exceptionally strong amounts of credibility that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from the online platform in February after the boy's family links emerged, and in July an corporation's own inquiry concluded it infringed the corporation's content policies on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will comply with the sanction as soon as the schedule and wording are finalised."
