The British broadcaster committed a "significant breach" of media regulations by failing to disclose that the narrator of a film about the Gaza situation was the son of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The authority has instructed the broadcaster to transmit a prime-time announcement about its conclusions.
"As this represents a major infringement of our code, we are ordering the BBC to broadcast a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," the statement read.
'Potential to Damage Confidence'
The regulator's statement stated: "Our investigation concluded that the film's omission to reveal that the narrator's male guardian served in a role in the Hamas-administered administration was significantly deceptive.
"This implied that the public did not have essential details which may have been highly relevant to their evaluation of the voice and the content he provided.
"Credibility is at the center of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the BBC.
"This error had the risk to erode the significantly high degrees of confidence that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from the online platform in last February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment determined it violated the organization's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in full. We will adhere to the sanction as soon as the date and wording are determined."
