The BBC was found to have committed a "significant breach" of industry standards by not revealing that the voice of a film about the Gaza situation was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to truthfulness".
The authority has instructed the corporation to broadcast a peak-time statement about its conclusions.
"As this represents a major infringement of our regulations, we are instructing the corporation to broadcast a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Risk to Damage Credibility'
The authority's statement declared: "Our investigation determined that the programme's failure to disclose that the narrator's parent served in a role in the Hamas-administered authority was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been very significant to their judgment of the presenter and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to damage the very considerable degrees of trust that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the boy's familial connections were revealed, and in July an broadcaster's internal assessment determined it infringed the corporation's content policies on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in full. We will follow the sanction as soon as the timing and language are finalised."
