The BBC was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a documentary about the Gaza situation was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
The authority has instructed the corporation to transmit a evening declaration about its findings.
"Since this amounts to a major infringement of our rules, we are directing the broadcaster to transmit a message of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Erode Confidence'
The watchdog's announcement said: "Our probe found that the programme's omission to reveal that the voice's parent served in a position in the Hamas-run authority was materially misleading.
"Consequently that the audience did not have essential details which may have been very significant to their assessment of the presenter and the content he presented.
"Credibility is at the core of the bond between a media organization and its viewers, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to undermine the very considerable amounts of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in February after the narrator's personal associations were revealed, and in July an corporation's own inquiry concluded it violated the corporation's content policies on accuracy.
A BBC spokesperson commented: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in full. We will follow the directive as soon as the timing and language are confirmed."
