The public service broadcaster committed a "major breach" of media regulations by omitting to mention that the voice of a film about the Gaza conflict was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
Ofcom has instructed the corporation to transmit a prime-time declaration about its findings.
"As this represents a serious breach of our code, we are directing the broadcaster to air a message of our findings against it on the BBC's second channel at 9pm, with a timing to be determined," the statement read.
'Risk to Damage Confidence'
The regulator's report stated: "The inquiry we conducted determined that the programme's omission to reveal that the narrator's male guardian occupied a post in the Hamas-run administration was materially misleading.
"It meant that the public did not have critical information which may have been extremely pertinent to their judgment of the narrator and the content he presented.
"Credibility is at the heart of the bond between a broadcaster and its public, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to damage the very considerable amounts of trust that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in the month of February after the presenter's familial connections were revealed, and in this past July an internal BBC review concluded it breached the corporation's editorial guidelines on accuracy.
A corporation official said: "The authority's determination is in accordance with the findings of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on truthfulness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the penalty as soon as the date and wording are finalised."
