The BBC was found to have committed a "major breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to broadcast a prime-time statement about its conclusions.
"Since this amounts to a significant violation of our regulations, we are directing the BBC to broadcast a statement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be finalised," the statement read.
'Possibility to Damage Trust'
The regulator's report said: "Our probe concluded that the film's lack of disclosure that the narrator's parent occupied a role in the Hamas-run government was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been highly relevant to their evaluation of the voice and the details he provided.
"Trust is at the heart of the connection between a media organization and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to damage the very considerable degrees of credibility that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the online platform in the month of February after the boy's familial connections came to light, and in the month of July an internal BBC review concluded it breached the broadcaster's editorial guidelines on accuracy.
A corporation official said: "The authority's determination is in line with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in full. We will adhere to the sanction as soon as the date and wording are confirmed."
