The BBC committed a "significant breach" of industry standards by omitting to mention that the narrator of a programme about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has instructed the BBC to air a peak-time statement about its findings.
"Since this amounts to a serious breach of our rules, we are instructing the broadcaster to transmit a announcement of our findings against it on BBC Two at 9pm, with a date to be finalised," the regulator stated.
'Risk to Damage Credibility'
The watchdog's statement said: "The inquiry we conducted concluded that the film's lack of disclosure that the voice's parent occupied a position in the Hamas-controlled government was significantly deceptive.
"It meant that the viewers did not have critical information which may have been very significant to their assessment of the voice and the content he shared.
"Credibility is at the heart of the bond between a television network and its audience, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the significantly high amounts of trust that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in the month of February after the presenter's familial connections were revealed, and in the month of July an corporation's own inquiry determined it infringed the organization's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in full. We will adhere to the sanction as soon as the timing and wording are finalised."
