The BBC was found to have committed a "significant breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the corporation to broadcast a evening announcement about its decisions.
"Given this constitutes a major infringement of our regulations, we are directing the corporation to transmit a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," it said.
'Potential to Undermine Trust'
The watchdog's statement declared: "Our probe determined that the documentary's omission to reveal that the presenter's parent occupied a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the audience did not have critical information which may have been highly relevant to their judgment of the voice and the details he presented.
"Confidence is at the heart of the relationship between a media organization and its viewers, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to erode the very considerable levels of confidence that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the narrator's family links came to light, and in July an internal BBC review found it breached the broadcaster's content policies on accuracy.
A BBC spokesperson said: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are confirmed."
