The British broadcaster committed a "major breach" of media regulations by failing to disclose that the narrator of a documentary about the Gaza situation was the son of a Hamas administrator, as determined by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the corporation to transmit a prime-time declaration about its findings.
"As this represents a serious breach of our rules, we are instructing the broadcaster to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Potential to Undermine Trust'
The authority's statement said: "The inquiry we conducted determined that the film's lack of disclosure that the presenter's parent served in a post in the Hamas-run government was significantly deceptive.
"This implied that the viewers did not have critical information which may have been highly relevant to their judgment of the voice and the details he shared.
"Credibility is at the center of the connection between a media organization and its audience, especially for a public service broadcaster such as the BBC.
"This failing had the potential to undermine the very considerable levels of confidence that viewers would have put in a BBC factual programme about the Israel-Gaza war."
The programme was withdrawn from the online platform in last February after the narrator's family links emerged, and in July an corporation's own inquiry concluded it infringed the broadcaster's content policies on accuracy.
A corporation official said: "The authority's determination is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the penalty as soon as the schedule and wording are confirmed."
