The public service broadcaster committed a "major breach" of media regulations by failing to disclose that the presenter of a film about Gaza was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our rules, we are ordering the BBC to broadcast a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a timing to be finalised," it said.
'Possibility to Erode Confidence'
The regulator's announcement said: "The inquiry we conducted found that the programme's omission to reveal that the presenter's parent held a position in the Hamas-run government was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the narrator and the details he presented.
"Credibility is at the heart of the relationship between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the possibility to erode the significantly high degrees of credibility that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the online platform in the month of February after the boy's familial connections came to light, and in this past July an internal BBC review determined it violated the corporation's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the authority's determination in full. We will adhere to the sanction as soon as the timing and wording are determined."
