The public service broadcaster committed a "serious breach" of industry standards by not revealing that the presenter of a film about Gaza was the child of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the corporation to broadcast a peak-time declaration about its conclusions.
"As this represents a significant violation of our code, we are directing the BBC to broadcast a message of our findings against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," it said.
'Possibility to Damage Trust'
The authority's report declared: "Our probe determined that the documentary's omission to reveal that the narrator's parent served in a post in the Hamas-controlled government was significantly deceptive.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Confidence is at the heart of the relationship between a broadcaster and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to erode the significantly high amounts of confidence that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from the online platform in the month of February after the boy's family links were revealed, and in this past July an internal BBC review determined it violated the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in its entirety. We will adhere to the penalty as soon as the schedule and wording are confirmed."
