The BBC was found to have committed a "significant breach" of media regulations by failing to disclose that the presenter of a documentary about the Gaza conflict was the child of a Hamas official, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the corporation to broadcast a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to transmit a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be finalised," the regulator stated.
The regulator's statement declared: "Our probe found that the programme's failure to disclose that the presenter's parent served in a post in the Hamas-controlled authority was substantially inaccurate.
"This implied that the public did not have critical information which may have been very significant to their judgment of the narrator and the details he provided.
"Trust is at the heart of the relationship between a broadcaster and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the very considerable levels of trust that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in February after the boy's family links were revealed, and in July an corporation's own inquiry concluded it breached the broadcaster's content policies on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will follow the directive as soon as the timing and language are determined."
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