The public service broadcaster engaged in a "significant breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the child of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The regulator has ordered the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the broadcaster to broadcast a message of our findings against it on the BBC's second channel at 9pm, with a timing to be determined," the regulator stated.
'Potential to Erode Confidence'
The authority's announcement said: "The inquiry we conducted concluded that the programme's omission to reveal that the narrator's father occupied a post in the Hamas-controlled administration was significantly deceptive.
"This implied that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the information he shared.
"Trust is at the heart of the relationship between a media organization and its viewers, particularly for a state-funded media outlet such as the BBC.
"This failing had the risk to undermine the very considerable levels of confidence that the public would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the online platform in February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment concluded it infringed the organization's editorial guidelines on accuracy.
A corporation official said: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the penalty as soon as the schedule and wording are confirmed."
