The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a film about Gaza was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to air a evening statement about its conclusions.
"Given this constitutes a major infringement of our code, we are ordering the broadcaster to air a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the statement read.
'Possibility to Erode Credibility'
The watchdog's report stated: "The inquiry we conducted concluded that the film's failure to disclose that the narrator's parent served in a post in the Hamas-administered government was materially misleading.
"It meant that the public did not have vital facts which may have been extremely pertinent to their judgment of the voice and the details he presented.
"Credibility is at the core of the bond between a television network and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the exceptionally strong amounts of confidence that the public would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from iPlayer in last February after the boy's familial connections came to light, and in July an broadcaster's internal assessment determined it breached the corporation's journalistic standards on factual correctness.
A BBC spokesperson said: "The regulator's decision is in line with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in full. We will follow the sanction as soon as the schedule and language are finalised."
