The BBC committed a "significant breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the BBC to broadcast a evening announcement about its decisions.
"Since this amounts to a serious breach of our code, we are instructing the broadcaster to transmit a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Risk to Erode Confidence'
The watchdog's announcement said: "Our investigation concluded that the film's omission to reveal that the presenter's male guardian held a position in the Hamas-controlled government was materially misleading.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the narrator and the content he shared.
"Confidence is at the heart of the relationship between a media organization and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to erode the exceptionally strong amounts of trust that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in last February after the presenter's familial connections emerged, and in July an corporation's own inquiry determined it violated the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in complete. We will comply with the directive as soon as the schedule and language are finalised."
