The BBC engaged in a "major breach" of industry standards by omitting to mention that the voice of a documentary about Gaza was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
The regulator has directed the broadcaster to air a peak-time announcement about its conclusions.
"As this represents a serious breach of our code, we are directing the broadcaster to broadcast a statement of our conclusions against it on BBC2 at 21:00, with a schedule to be confirmed," the regulator stated.
'Potential to Damage Credibility'
The regulator's statement declared: "Our investigation determined that the documentary's lack of disclosure that the presenter's father held a position in the Hamas-run administration was significantly deceptive.
"It meant that the public did not have critical information which may have been highly relevant to their assessment of the presenter and the details he provided.
"Credibility is at the center of the relationship between a broadcaster and its audience, notably for a national broadcasting corporation such as the BBC.
"This error had the risk to erode the exceptionally strong levels of confidence that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The film was withdrawn from the online platform in February after the narrator's familial connections were revealed, and in July an broadcaster's internal assessment concluded it infringed the organization's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a serious error 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 agree with the regulator's ruling in its entirety. We will comply with the sanction as soon as the timing and wording are confirmed."
