The BBC committed a "serious breach" of media regulations by omitting to mention that the narrator of a film about Gaza was the offspring of a Hamas administrator, according to British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The regulator has instructed the corporation to transmit a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our code, we are ordering the BBC to air a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Possibility to Undermine Credibility'
The regulator's report said: "Our probe found that the documentary's failure to disclose that the voice's male guardian served in a position in the Hamas-run government was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the voice and the content he presented.
"Credibility is at the core of the relationship between a television network and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to erode the significantly high amounts of trust that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the online platform in February after the presenter's family links were revealed, and in the month of July an internal BBC review concluded it violated the broadcaster's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in complete. We will adhere to the sanction as soon as the schedule and wording are confirmed."
