The British broadcaster engaged in a "significant breach" of broadcasting rules by failing to disclose that the narrator of a programme about Gaza was the child of a Hamas official, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to factual correctness".
The authority has instructed the broadcaster to transmit a evening announcement about its conclusions.
"As this represents a serious breach of our regulations, we are directing the corporation to broadcast a statement of our findings against it on BBC Two at 9pm, with a date to be determined," the regulator stated.
'Potential to Erode Confidence'
The authority's announcement said: "The inquiry we conducted determined that the film's lack of disclosure that the voice's father occupied a position in the Hamas-run administration was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Confidence is at the core of the bond between a television network and its public, especially for a state-funded media outlet such as the BBC.
"This oversight had the possibility to damage the very considerable degrees of credibility that audiences would have put in a BBC factual programme about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in February after the narrator's familial connections emerged, and in this past July an internal BBC review found it infringed the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The regulator's decision is in agreement with the results of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in complete. We will comply with the penalty as soon as the date and language are determined."
