The public service broadcaster engaged in a "major breach" of industry standards by not revealing that the presenter of a documentary about Gaza was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to factual correctness".
The regulator has instructed the corporation to transmit a prime-time statement about its conclusions.
"Since this amounts to a significant violation of our regulations, we are ordering the corporation to air a message of our determinations against it on BBC Two at 21:00, with a timing to be determined," it said.
'Potential to Undermine Confidence'
The authority's statement declared: "Our probe concluded that the documentary's lack of disclosure that the voice's male guardian held a position in the Hamas-controlled administration was significantly deceptive.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he provided.
"Credibility is at the core of the connection between a media organization and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the significantly high amounts of trust that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in February after the boy's familial connections were revealed, and in July an broadcaster's internal assessment found it infringed the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in its entirety. We will follow the penalty as soon as the schedule and language are confirmed."
