The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza situation was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to accuracy".
The authority has ordered the corporation to broadcast a evening declaration about its findings.
"Since this amounts to a significant violation of our regulations, we are directing the BBC to air a statement of our determinations against it on BBC Two at 9pm, with a timing to be determined," the statement read.
'Possibility to Undermine Confidence'
The authority's report said: "Our investigation determined that the documentary's lack of disclosure that the voice's parent occupied a post in the Hamas-administered government was significantly deceptive.
"This implied that the audience did not have vital facts which may have been highly relevant to their evaluation of the voice and the content he shared.
"Confidence is at the core of the bond between a media organization and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to damage the very considerable degrees of credibility that the public would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's familial connections came to light, and in the month of July an broadcaster's internal assessment determined it infringed the broadcaster's journalistic standards on truthfulness.
A corporation official commented: "The authority's determination is in line with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in full. We will follow the sanction as soon as the date and wording are finalised."
