The BBC committed a "significant breach" of media regulations by not revealing that the presenter of a film about Gaza was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the broadcaster to broadcast a peak-time statement about its findings.
"Given this constitutes a major infringement of our rules, we are directing the corporation to air a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the regulator stated.
'Possibility to Undermine Confidence'
The authority's statement declared: "Our investigation found that the programme's failure to disclose that the narrator's father held a role in the Hamas-controlled administration was materially misleading.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he provided.
"Confidence is at the center of the relationship between a television network and its audience, notably for a public service broadcaster such as the public broadcaster.
"This failing had the risk to undermine the exceptionally strong amounts of trust that audiences would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in last February after the boy's family links emerged, and in July an broadcaster's internal assessment concluded it infringed the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in complete. We will adhere to the penalty as soon as the timing and wording are confirmed."
