The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the narrator of a film about Gaza was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The regulator has directed the BBC to air a evening announcement about its decisions.
"Since this amounts to a significant violation of our regulations, we are instructing the corporation to broadcast a announcement of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," the regulator stated.
'Risk to Erode Confidence'
The regulator's statement said: "Our investigation concluded that the documentary's omission to reveal that the narrator's parent occupied a position in the Hamas-administered administration was significantly deceptive.
"It meant that the audience did not have essential details which may have been extremely pertinent to their judgment of the narrator and the details he presented.
"Trust is at the heart of the bond between a television network and its audience, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the significantly high levels of credibility that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the online platform in last February after the boy's family links were revealed, and in this past July an corporation's own inquiry concluded it violated the corporation's content policies on factual correctness.
A BBC spokesperson stated: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in full. We will follow the penalty as soon as the date and language are finalised."
