The British broadcaster engaged in a "serious breach" of industry standards by omitting to mention that the presenter of a documentary about Gaza was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The authority has instructed the corporation to broadcast a prime-time declaration about its conclusions.
"Since this amounts to a serious breach of our code, we are instructing the BBC to air a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Possibility to Damage Credibility'
The watchdog's statement said: "The inquiry we conducted determined that the programme's lack of disclosure that the voice's father occupied a role in the Hamas-run authority was materially misleading.
"This implied that the audience did not have critical information which may have been very significant to their assessment of the presenter and the information he shared.
"Trust is at the center of the connection between a television network and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the potential to damage the exceptionally strong amounts of confidence that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the online platform in last February after the presenter's family links came to light, and in July an internal BBC review concluded it violated the corporation's content policies on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a significant failing in the film in relation to the corporation's content standards on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in full. We will comply with the sanction as soon as the timing and wording are finalised."
