The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the presenter of a film about the Gaza conflict was the son of a Hamas representative, according to regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the corporation to air a peak-time declaration about its conclusions.
"Given this constitutes a major infringement of our code, we are instructing the corporation to broadcast a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," it said.
'Possibility to Undermine Trust'
The authority's statement stated: "Our investigation found that the film's lack of disclosure that the narrator's male guardian served in a role in the Hamas-run authority was substantially inaccurate.
"This implied that the public did not have vital facts which may have been highly relevant to their evaluation of the narrator and the details he provided.
"Trust is at the heart of the relationship between a television network and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the exceptionally strong degrees of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in the month of February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment found it infringed the organization's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in full. We will follow the directive as soon as the schedule and language are finalised."
