The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the narrator of a film about Gaza was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to transmit a evening declaration about its findings.
"Since this amounts to a serious breach of our code, we are ordering the BBC to broadcast a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Undermine Confidence'
The authority's report stated: "The inquiry we conducted concluded that the programme's lack of disclosure that the presenter's father held a role in the Hamas-run administration was materially misleading.
"It meant that the public did not have vital facts which may have been highly relevant to their assessment of the narrator and the details he shared.
"Credibility is at the heart of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to damage the significantly high degrees of credibility that audiences would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's family links emerged, and in this past July an broadcaster's internal assessment concluded it violated the corporation's content policies on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in complete. We will comply with the penalty as soon as the date and wording are confirmed."
