The BBC was found to have committed a "significant breach" of media regulations by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a peak-time announcement about its decisions.
"Since this amounts to a significant violation of our code, we are instructing the broadcaster to air a statement of our determinations against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the regulator stated.
'Risk to Erode Credibility'
The regulator's report said: "The inquiry we conducted concluded that the film's lack of disclosure that the presenter's parent served in a position in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the content he presented.
"Trust is at the heart of the relationship between a broadcaster and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high levels of credibility that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in February after the boy's personal associations were revealed, and in July an internal BBC review concluded it violated the corporation's journalistic standards on accuracy.
A BBC spokesperson said: "The authority's determination is in agreement with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will adhere to the penalty as soon as the schedule and language are determined."
