The British broadcaster committed a "major breach" of media regulations by not revealing that the presenter of a programme about Gaza was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to transmit a peak-time announcement about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to transmit a message of our determinations against it on the BBC's second channel at 21:00, with a date to be confirmed," the statement read.
'Potential to Damage Confidence'
The authority's statement declared: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's parent served in a role in the Hamas-run authority was significantly deceptive.
"Consequently that the audience did not have essential details which may have been very significant to their judgment of the narrator and the information he presented.
"Trust is at the center of the relationship between a media organization and its audience, especially for a public service broadcaster such as the BBC.
"This failing had the possibility to undermine the significantly high levels of confidence that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment concluded it infringed the corporation's editorial guidelines on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in full. We will follow the penalty as soon as the timing and language are confirmed."
