The British broadcaster was found to have committed a "major breach" of industry standards by failing to disclose that the presenter of a film about Gaza was the son of a Hamas representative, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
The authority has directed the corporation to transmit a peak-time announcement about its conclusions.
"As this represents a significant violation of our code, we are instructing the BBC to broadcast a announcement of our conclusions against it on BBC2 at 9pm, with a date to be finalised," the statement read.
'Potential to Damage Trust'
The authority's announcement said: "Our probe found that the documentary's failure to disclose that the narrator's father served in a role in the Hamas-run administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their assessment of the presenter and the information he presented.
"Confidence is at the core of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable degrees of trust that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry determined it violated the broadcaster's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will adhere to the penalty as soon as the timing and wording are confirmed."
