The British broadcaster engaged in a "significant breach" of broadcasting rules by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the BBC to broadcast a evening declaration about its conclusions.
"Since this amounts to a significant violation of our regulations, we are directing the BBC to transmit a statement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," it said.
'Potential to Damage Confidence'
The regulator's announcement stated: "Our investigation determined that the programme's omission to reveal that the presenter's male guardian served in a role in the Hamas-administered administration was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been highly relevant to their evaluation of the presenter and the details he shared.
"Confidence is at the core of the relationship between a media organization and its public, notably for a national broadcasting corporation such as the BBC.
"This error had the risk to damage the significantly high amounts of credibility that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from the online platform in February after the boy's familial connections were revealed, and in the month of July an corporation's own inquiry found it violated the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will follow the directive as soon as the schedule and wording are finalised."
