The British broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
The regulator has directed the broadcaster to transmit a peak-time announcement about its findings.
"As this represents a major infringement of our code, we are directing the corporation to air a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Risk to Undermine Trust'
The watchdog's statement said: "Our probe found that the film's omission to reveal that the presenter's parent occupied a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been very significant to their assessment of the narrator and the details he presented.
"Trust is at the heart of the connection between a media organization and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to damage the exceptionally strong amounts of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the online platform in February after the presenter's familial connections were revealed, and in July an corporation's own inquiry found it breached the organization's journalistic standards on factual correctness.
A representative for the broadcaster said: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the authority's determination in full. We will adhere to the penalty as soon as the schedule and language are finalised."
