The BBC engaged in a "significant breach" of broadcasting rules by failing to disclose that the narrator of a documentary about the Gaza situation was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to truthfulness".
Ofcom has ordered the BBC to air a peak-time declaration about its conclusions.
"Given this constitutes a major infringement of our regulations, we are directing the broadcaster to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," it said.
'Potential to Undermine Confidence'
The watchdog's statement stated: "Our probe determined that the documentary's omission to reveal that the voice's male guardian held a post in the Hamas-controlled authority was materially misleading.
"Consequently that the viewers did not have critical information which may have been very significant to their judgment of the voice and the information he presented.
"Confidence is at the core of the relationship between a television network and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the potential to undermine the significantly high degrees of credibility that audiences would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from iPlayer in last February after the presenter's family links were revealed, and in the month of July an broadcaster's internal assessment concluded it infringed the corporation's content policies on accuracy.
A BBC spokesperson said: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the sanction as soon as the date and wording are confirmed."
