The public service broadcaster committed a "significant breach" of industry standards by omitting to mention that the presenter of a documentary about Gaza was the offspring of a Hamas official, according to British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the broadcaster to broadcast a prime-time announcement about its findings.
"Since this amounts to a major infringement of our code, we are instructing the corporation to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be confirmed," the regulator stated.
'Risk to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the documentary's failure to disclose that the voice's father held a position in the Hamas-administered administration was substantially inaccurate.
"Consequently that the public did not have critical information which may have been highly relevant to their evaluation of the voice and the details he presented.
"Confidence is at the heart of the bond between a broadcaster and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to damage the very considerable amounts of confidence that viewers would have invested in a BBC factual programme about the Gaza conflict."
The film was withdrawn from iPlayer in last February after the narrator's familial connections were revealed, and in July an broadcaster's internal assessment determined it breached the broadcaster's content policies on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in full. We will adhere to the penalty as soon as the schedule and wording are confirmed."
