The public service broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has directed the corporation to air a prime-time declaration about its findings.
"As this represents a serious breach of our regulations, we are instructing the broadcaster to broadcast a announcement of our determinations against it on BBC Two at 9pm, with a timing to be confirmed," the statement read.
'Potential to Erode Trust'
The authority's statement declared: "Our probe determined that the film's failure to disclose that the presenter's male guardian held a position in the Hamas-administered authority was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been very significant to their judgment of the voice and the content he provided.
"Trust is at the heart of the relationship between a television network and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the exceptionally strong amounts of trust that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from iPlayer in February after the presenter's familial connections were revealed, and in the month of July an broadcaster's internal assessment determined it violated the organization's journalistic standards on truthfulness.
A corporation official said: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will adhere to the penalty as soon as the date and wording are determined."
