The British broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the voice of a programme about Gaza was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The authority has instructed the broadcaster to transmit a prime-time declaration about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the corporation to transmit a message of our determinations against it on the BBC's second channel at 9pm, with a schedule to be determined," the regulator stated.
'Risk to Damage Credibility'
The authority's statement stated: "Our investigation concluded that the programme's failure to disclose that the voice's parent occupied a position in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have essential details which may have been very significant to their assessment of the narrator and the details he provided.
"Confidence is at the heart of the bond between a media organization and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high amounts of credibility that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's family links were revealed, and in this past July an broadcaster's internal assessment found it breached the corporation's content policies on factual correctness.
A corporation official commented: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will follow the directive as soon as the date and wording are confirmed."
