The BBC committed a "serious breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The regulator has instructed the corporation to transmit a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our regulations, we are instructing the BBC to broadcast a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the statement read.
'Possibility to Damage Confidence'
The regulator's report stated: "The inquiry we conducted found that the documentary's omission to reveal that the narrator's male guardian served in a position in the Hamas-administered government was significantly deceptive.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the narrator and the information he shared.
"Trust is at the center of the bond between a media organization and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the significantly high amounts of credibility that viewers would have put in a BBC factual programme about the conflict in Gaza."
The film was removed from the BBC's streaming service in last February after the narrator's personal associations were revealed, and in this past July an internal BBC review determined it violated the organization's content policies on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in full. We will adhere to the directive as soon as the schedule and wording are finalised."
