The public service broadcaster engaged in a "serious breach" of broadcasting rules by failing to disclose that the narrator of a film about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to factual correctness".
The authority has ordered the BBC to air a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our rules, we are instructing the broadcaster to transmit a message of our findings against it on BBC Two at 9pm, with a schedule to be confirmed," it said.
'Risk to Undermine Credibility'
The regulator's report stated: "The inquiry we conducted determined that the programme's omission to reveal that the voice's male guardian occupied a role in the Hamas-controlled government was substantially inaccurate.
"It meant that the public did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the details he provided.
"Trust is at the heart of the bond between a television network and its audience, especially for a public service broadcaster such as the BBC.
"This failing had the possibility to undermine the significantly high degrees of credibility that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was removed from the online platform in February after the presenter's familial connections emerged, and in July an internal BBC review found it violated the organization's editorial guidelines on accuracy.
A corporation official stated: "The regulator's decision is in line with the findings of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will follow the sanction as soon as the date and language are determined."
