The British broadcaster engaged in a "major breach" of media regulations by not revealing that the voice of a film about the Gaza conflict was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The regulator has ordered the corporation to air a evening declaration about its decisions.
"Given this constitutes a significant violation of our code, we are instructing the corporation to transmit a message of our determinations against it on BBC2 at 9pm, with a timing to be determined," it said.
'Potential to Undermine Trust'
The regulator's statement said: "Our investigation found that the film's failure to disclose that the voice's father held a role in the Hamas-administered government was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their judgment of the voice and the content he shared.
"Credibility is at the heart of the relationship between a television network and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to undermine the significantly high levels of credibility that audiences would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from iPlayer in last February after the boy's personal associations emerged, and in this past July an broadcaster's internal assessment found it violated the corporation's journalistic standards on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the penalty as soon as the schedule and wording are determined."
