The British broadcaster was found to have committed a "serious breach" of media regulations by failing to disclose that the voice of a programme about Gaza was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog 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".
Ofcom has directed the corporation to broadcast a peak-time declaration about its findings.
"Since this amounts to a significant violation of our code, we are ordering the BBC to air a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Erode Confidence'
The regulator's statement said: "Our probe concluded that the film's lack of disclosure that the narrator's parent occupied a post in the Hamas-run administration was materially misleading.
"Consequently that the viewers did not have essential details which may have been highly relevant to their assessment of the voice and the content he shared.
"Trust is at the heart of the relationship between a media organization and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to erode the significantly high degrees of confidence that the public would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was removed from iPlayer in February after the boy's family links were revealed, and in this past July an corporation's own inquiry determined it violated the corporation's journalistic standards on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the results 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 aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the penalty as soon as the date and language are finalised."
