The British broadcaster engaged in a "significant breach" of broadcasting rules by omitting to mention that the narrator of a film about Gaza was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The authority has ordered the BBC to air a peak-time statement about its findings.
"As this represents a significant violation of our rules, we are ordering the BBC to transmit a statement of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," it said.
'Potential to Damage Trust'
The watchdog's announcement stated: "The inquiry we conducted concluded that the programme's omission to reveal that the voice's father served in a post in the Hamas-run administration was substantially inaccurate.
"It meant that the public did not have critical information which may have been extremely pertinent to their evaluation of the voice and the content he provided.
"Confidence is at the heart of the connection between a television network and its public, especially for a public service broadcaster such as the BBC.
"This oversight had the possibility to damage the very considerable amounts of confidence that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from iPlayer in last February after the boy's family links emerged, and in the month of July an broadcaster's internal assessment concluded it violated the corporation's journalistic standards on truthfulness.
A BBC spokesperson said: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will comply with the sanction as soon as the schedule and language are confirmed."
