The public service broadcaster committed a "major breach" of industry standards by omitting to mention that the voice of a film about the Gaza conflict was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to accuracy".
Ofcom has directed the BBC to air a peak-time declaration about its findings.
"As this represents a major infringement of our code, we are instructing the broadcaster to broadcast a message of our determinations against it on BBC2 at 21:00, with a timing to be confirmed," it said.
'Possibility to Damage Trust'
The regulator's report stated: "The inquiry we conducted found that the film's lack of disclosure that the narrator's father occupied a post in the Hamas-administered authority was significantly deceptive.
"Consequently that the public did not have essential details which may have been extremely pertinent to their judgment of the voice and the content he shared.
"Credibility is at the core of the bond between a broadcaster and its audience, notably for a public service broadcaster such as the BBC.
"This error had the potential to undermine the very considerable levels of credibility that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in last February after the presenter's personal associations emerged, and in July an corporation's own inquiry determined it violated the organization's content policies on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in line with the results of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the date and language are finalised."
