The British broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the presenter of a documentary about the Gaza situation was the son of a Hamas official, as ruled by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a significant failing in relation to factual correctness".
The regulator has directed the BBC to broadcast a evening declaration about its findings.
"Since this amounts to a major infringement of our regulations, we are directing the BBC to broadcast a message of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," the regulator stated.
'Risk to Undermine Trust'
The authority's announcement stated: "Our investigation found that the film's failure to disclose that the voice's parent served in a post in the Hamas-administered authority was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their judgment of the presenter and the details he shared.
"Trust is at the center of the bond between a media organization and its audience, notably for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to erode the very considerable amounts of trust that audiences would have put in a BBC factual programme about the conflict in Gaza."
The film was removed from the BBC's streaming service in the month of February after the boy's familial connections were revealed, and in July an corporation's own inquiry concluded it violated the broadcaster's journalistic standards on factual correctness.
A corporation official said: "The Ofcom ruling is in agreement 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 Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in complete. We will follow the sanction as soon as the timing and wording are determined."
