The British broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The regulator has directed the BBC to broadcast a prime-time announcement about its findings.
"Given this constitutes a serious breach of our regulations, we are directing the BBC to air a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Risk to Damage Trust'
The regulator's statement declared: "Our probe found that the programme's omission to reveal that the voice's parent occupied a role in the Hamas-run administration was materially misleading.
"It meant that the public did not have vital facts which may have been very significant to their judgment of the presenter and the information he shared.
"Confidence is at the core of the relationship between a broadcaster and its audience, notably for a public service broadcaster such as the BBC.
"This failing had the possibility to erode the very considerable levels of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from iPlayer in February after the presenter's family links were revealed, and in this past July an broadcaster's internal assessment concluded it violated the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will follow the penalty as soon as the timing and language are confirmed."
