The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the narrator of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has ordered the corporation to air a peak-time declaration about its findings.
"Given this constitutes a major infringement of our rules, we are ordering the corporation to broadcast a statement of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The watchdog's announcement said: "Our investigation found that the documentary's failure to disclose that the presenter's male guardian occupied a position in the Hamas-controlled authority was substantially inaccurate.
"It meant that the public did not have essential details which may have been highly relevant to their judgment of the presenter and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to damage the significantly high degrees of trust that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from the online platform in February after the boy's family links emerged, and in this past July an corporation's own inquiry concluded it infringed the broadcaster's editorial guidelines on truthfulness.
A corporation official commented: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and wording are finalised."
