The British broadcaster committed a "major breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The authority has ordered the broadcaster to transmit a prime-time announcement about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to transmit a statement of our conclusions against it on BBC2 at 9pm, with a schedule to be finalised," it said.
'Risk to Erode Trust'
The authority's announcement stated: "Our probe concluded that the programme's omission to reveal that the voice's father served in a role in the Hamas-administered authority was significantly deceptive.
"It meant that the public did not have vital facts which may have been very significant to their evaluation of the presenter and the details he provided.
"Credibility is at the heart of the relationship between a media organization and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to undermine the exceptionally strong amounts of credibility that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from iPlayer in last February after the presenter's personal associations emerged, and in this past July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will comply with the sanction as soon as the date and language are finalised."
