The British broadcaster engaged in a "serious breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a significant failing in relation to accuracy".
The regulator has ordered the BBC to transmit a peak-time statement about its conclusions.
"Given this constitutes a significant violation of our rules, we are directing the BBC to broadcast a message of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be confirmed," the statement read.
'Risk to Undermine Trust'
The regulator's report declared: "Our probe concluded that the programme's omission to reveal that the voice's parent held a role in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been highly relevant to their judgment of the voice and the information he presented.
"Credibility is at the center of the connection between a television network and its audience, particularly for a public service broadcaster such as the BBC.
"This oversight had the potential to undermine the exceptionally strong degrees of trust that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from the BBC's streaming service in the month of February after the presenter's family links came to light, and in July an broadcaster's internal assessment concluded it infringed the corporation's editorial guidelines on accuracy.
A BBC spokesperson said: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in its entirety. We will follow the sanction as soon as the timing and language are finalised."
