The public service broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza conflict was the child of a Hamas representative, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a serious breach of our rules, we are directing the BBC to air a message of our conclusions against it on the BBC's second channel at 9pm, with a date to be confirmed," it said.
'Potential to Erode Confidence'
The regulator's announcement stated: "Our probe determined that the documentary's failure to disclose that the narrator's father occupied a position in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have vital facts which may have been very significant to their assessment of the voice and the information he provided.
"Trust is at the center of the connection between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to erode the very considerable levels of credibility that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the online platform in February after the narrator's personal associations emerged, and in July an broadcaster's internal assessment concluded it breached the organization's journalistic standards on factual correctness.
A BBC spokesperson said: "The authority's determination is in accordance with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and wording are finalised."
