The BBC was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a programme about Gaza was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
The authority has ordered the corporation to transmit a evening declaration about its decisions.
"Given this constitutes a significant violation of our regulations, we are directing the corporation to transmit a statement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Possibility to Erode Confidence'
The authority's report stated: "The inquiry we conducted found that the documentary's omission to reveal that the voice's male guardian occupied a post in the Hamas-controlled government was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been highly relevant to their judgment of the voice and the content he presented.
"Trust is at the heart of the relationship between a media organization and its audience, notably for a national broadcasting corporation such as the BBC.
"This failing had the potential to undermine the exceptionally strong levels of confidence that audiences would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's family links emerged, and in this past July an corporation's own inquiry concluded it infringed the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will adhere to the directive as soon as the date and language are determined."
