The British broadcaster committed a "significant breach" of industry standards by failing to disclose that the voice of a programme about the Gaza situation was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has directed the corporation to transmit a peak-time announcement about its findings.
"Since this amounts to a significant violation of our code, we are directing the BBC to transmit a announcement of our conclusions against it on BBC Two at 21:00, with a timing to be determined," it said.
'Risk to Damage Credibility'
The watchdog's report said: "Our probe determined that the film's failure to disclose that the narrator's father served in a position in the Hamas-run authority was substantially inaccurate.
"It meant that the audience did not have essential details which may have been highly relevant to their judgment of the narrator and the content he provided.
"Confidence is at the center of the relationship between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This failing had the risk to erode the very considerable levels of trust that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in the month of February after the narrator's familial connections were revealed, and in this past July an corporation's own inquiry found it infringed the corporation's journalistic standards on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the directive as soon as the date and language are confirmed."
