The public service broadcaster engaged in a "significant breach" of media regulations by not revealing that the voice of a programme about the Gaza conflict was the child of a Hamas representative, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the BBC to air a peak-time statement about its decisions.
"As this represents a significant violation of our code, we are ordering the BBC to transmit a statement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," it said.
'Potential to Erode Confidence'
The authority's statement stated: "Our investigation concluded that the documentary's lack of disclosure that the narrator's male guardian held a post in the Hamas-administered government was materially misleading.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the information he provided.
"Trust is at the core of the connection between a media organization and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the possibility to damage the exceptionally strong amounts of trust that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the BBC's streaming service in February after the boy's personal associations emerged, and in the month of July an broadcaster's internal assessment found it breached the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in full. We will follow the penalty as soon as the timing and wording are confirmed."
