The British broadcaster was found to have committed a "serious breach" of industry standards by failing to disclose that the presenter of a film about the Gaza situation was the offspring of a Hamas official, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
The authority has ordered the corporation to broadcast a prime-time announcement about its conclusions.
"Given this constitutes a serious breach of our rules, we are instructing the BBC to air a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be finalised," it said.
'Risk to Undermine Confidence'
The regulator's announcement declared: "The inquiry we conducted found that the programme's lack of disclosure that the presenter's male guardian served in a post in the Hamas-run authority was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been highly relevant to their judgment of the voice and the details he presented.
"Credibility is at the heart of the connection between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to erode the exceptionally strong degrees of credibility that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment concluded it violated the organization's content policies on truthfulness.
A corporation official commented: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in full. We will comply with the directive as soon as the date and wording are confirmed."
