The British broadcaster was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to accuracy".
The regulator has directed the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a significant violation of our rules, we are ordering the BBC to transmit a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," it said.
'Possibility to Damage Credibility'
The authority's report said: "The inquiry we conducted determined that the film's omission to reveal that the narrator's father served in a role in the Hamas-run authority was materially misleading.
"This implied that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the details he provided.
"Credibility is at the core of the connection between a media organization and its public, especially for a public service broadcaster such as the BBC.
"This error had the possibility to undermine the exceptionally strong amounts of confidence that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from iPlayer in February after the narrator's family links came to light, and in July an corporation's own inquiry determined it infringed the broadcaster's journalistic standards on truthfulness.
A corporation official said: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in complete. We will comply with the penalty as soon as the timing and wording are confirmed."
