The public service broadcaster was found to have committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a programme about Gaza was the offspring of a Hamas official, according to UK media regulator Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
Ofcom has directed the BBC to broadcast a prime-time announcement about its findings.
"As this represents a serious breach of our regulations, we are ordering the broadcaster to transmit a announcement of our conclusions against it on BBC Two at 21:00, with a timing to be finalised," it said.
'Possibility to Erode Trust'
The regulator's report declared: "Our investigation found that the documentary's omission to reveal that the voice's father held a position in the Hamas-administered authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the content he shared.
"Credibility is at the heart of the relationship between a media organization and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to undermine the significantly high degrees of trust that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from the BBC's streaming service in last February after the boy's personal associations emerged, and in July an internal BBC review found it violated the broadcaster's journalistic standards on factual correctness.
A corporation official stated: "The authority's determination is in accordance with the results of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in full. We will adhere to the penalty as soon as the schedule and wording are determined."
