The BBC engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the son of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to transmit a evening announcement about its findings.
"Since this amounts to a major infringement of our code, we are ordering the BBC to air a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Damage Credibility'
The regulator's announcement stated: "The inquiry we conducted concluded that the documentary's omission to reveal that the narrator's parent held a role in the Hamas-run government was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been highly relevant to their assessment of the narrator and the details he shared.
"Trust is at the center of the relationship between a broadcaster and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the risk to undermine the very considerable levels of trust that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in February after the presenter's family links came to light, and in this past July an corporation's own inquiry concluded it violated the organization's content policies on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in full. We will comply with the directive as soon as the date and language are determined."
