The public service broadcaster committed a "significant breach" of media regulations by not revealing that the presenter of a film about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
Ofcom has ordered the corporation to broadcast a prime-time announcement about its conclusions.
"As this represents a significant violation of our code, we are directing the BBC to transmit a message of our findings against it on BBC2 at 9pm, with a timing to be determined," it said.
'Potential to Damage Credibility'
The watchdog's report declared: "Our investigation found that the film's omission to reveal that the voice's male guardian served in a role in the Hamas-administered government was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the details he provided.
"Confidence is at the heart of the bond between a media organization and its audience, notably for a state-funded media outlet such as the BBC.
"This oversight had the potential to undermine the exceptionally strong levels of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in last February after the narrator's family links emerged, and in this past July an broadcaster's internal assessment found it violated the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in full. We will comply with the penalty as soon as the timing and language are finalised."
