The BBC was found to have committed a "significant breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza situation was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The authority has instructed the corporation to transmit a evening announcement about its findings.
"Since this amounts to a significant violation of our regulations, we are ordering the BBC to air a announcement of our determinations against it on BBC Two at 9pm, with a date to be finalised," it said.
'Possibility to Damage Trust'
The authority's report said: "Our probe concluded that the film's failure to disclose that the narrator's parent served in a post in the Hamas-controlled administration was materially misleading.
"It meant that the audience did not have vital facts which may have been highly relevant to their assessment of the voice and the information he shared.
"Confidence is at the center of the relationship between a television network and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to damage the exceptionally strong amounts of credibility that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment determined it breached the broadcaster's journalistic standards on accuracy.
A corporation official said: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in full. We will follow the penalty as soon as the date and wording are confirmed."
