The British broadcaster engaged in a "major breach" of media regulations by failing to disclose that the narrator of a programme about the Gaza situation was the son of a Hamas representative, according to regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The authority has directed the BBC to transmit a evening announcement about its decisions.
"Since this amounts to a major infringement of our rules, we are instructing the BBC to transmit a message of our findings against it on BBC Two at 9pm, with a schedule to be finalised," the statement read.
'Possibility to Undermine Credibility'
The authority's report declared: "The inquiry we conducted concluded that the film's omission to reveal that the narrator's parent occupied a position in the Hamas-run government was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he shared.
"Trust is at the heart of the relationship between a broadcaster and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to undermine the very considerable degrees of trust that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in last February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's editorial guidelines on truthfulness.
A corporation official commented: "The regulator's decision is in line 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 accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept Ofcom's decision in full. We will comply with the sanction as soon as the timing and wording are finalised."
