The BBC was found to have committed a "serious breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the child of a Hamas official, according to UK media regulator 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 earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The authority has ordered the corporation to transmit a prime-time statement about its conclusions.
"Given this constitutes a major infringement of our code, we are instructing the broadcaster to transmit a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," it said.
'Risk to Erode Confidence'
The regulator's announcement declared: "Our investigation concluded that the programme's omission to reveal that the presenter's parent held a role in the Hamas-run administration was materially misleading.
"It meant that the viewers did not have essential details which may have been highly relevant to their evaluation of the narrator and the information he shared.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to damage the exceptionally strong degrees of confidence that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the BBC's streaming service in last February after the boy's personal associations emerged, and in the month of July an corporation's own inquiry determined it infringed the corporation's journalistic standards on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the authority's determination in its entirety. We will comply with the sanction as soon as the date and language are finalised."
