The public service broadcaster engaged in a "significant breach" of media regulations by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has directed the broadcaster to broadcast a prime-time announcement about its conclusions.
"Given this constitutes a major infringement of our rules, we are instructing the broadcaster to broadcast a statement of our determinations against it on the BBC's second channel at 9pm, with a schedule to be confirmed," it said.
'Possibility to Erode Credibility'
The regulator's announcement declared: "Our probe determined that the programme's omission to reveal that the narrator's male guardian served in a position in the Hamas-run administration was significantly deceptive.
"It meant that the audience did not have essential details which may have been highly relevant to their judgment of the presenter and the details he provided.
"Trust is at the center of the relationship between a television network and its viewers, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to erode the exceptionally strong degrees of confidence that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the online platform in last February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment found it breached the corporation's journalistic standards on accuracy.
A corporation official stated: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will adhere to the penalty as soon as the timing and language are determined."
