The British broadcaster engaged in a "serious breach" of media regulations by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to truthfulness".
The regulator has directed the BBC to broadcast a prime-time announcement about its conclusions.
"As this represents a major infringement of our code, we are directing the BBC to broadcast a announcement of our determinations against it on BBC2 at 9pm, with a date to be finalised," it said.
'Possibility to Undermine Credibility'
The watchdog's report said: "The inquiry we conducted found that the documentary's lack of disclosure that the narrator's male guardian occupied a role in the Hamas-controlled administration was substantially inaccurate.
"It meant that the public did not have vital facts which may have been very significant to their evaluation of the voice and the details he shared.
"Trust is at the center of the relationship between a media organization and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to undermine the exceptionally strong amounts of confidence that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The programme was pulled from iPlayer in February after the boy's familial connections came to light, and in the month of July an corporation's own inquiry determined it infringed the organization's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will follow the directive as soon as the schedule and wording are finalised."
