The British broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the voice of a film about the Gaza situation was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to accuracy".
The authority has instructed the corporation to broadcast a peak-time announcement about its findings.
"As this represents a serious breach of our code, we are directing the broadcaster to transmit 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.
'Risk to Damage Trust'
The regulator's statement stated: "The inquiry we conducted determined that the programme's omission to reveal that the narrator's male guardian held a post in the Hamas-administered authority was materially misleading.
"This implied that the public did not have critical information which may have been highly relevant to their evaluation of the narrator and the content he provided.
"Trust is at the center of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to damage the significantly high levels of confidence that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The film was withdrawn from the online platform in last February after the presenter's personal associations came to light, and in this past July an corporation's own inquiry determined it breached the broadcaster's journalistic standards on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will follow the penalty as soon as the schedule and wording are finalised."
