The British broadcaster engaged in a "serious breach" of industry standards by not revealing that the voice of a documentary about the Gaza situation was the son of a Hamas official, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to accuracy".
Ofcom has ordered the BBC to air a evening announcement about its conclusions.
"Since this amounts to a major infringement of our rules, we are instructing the broadcaster to broadcast a message of our findings against it on BBC2 at 21:00, with a timing to be determined," the statement read.
'Potential to Damage Credibility'
The authority's report declared: "The inquiry we conducted determined that the documentary's failure to disclose that the presenter's parent held a post in the Hamas-run authority was materially misleading.
"It meant that the public 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 center of the bond between a media organization and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable degrees of trust that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from iPlayer in the month of February after the narrator's personal associations were revealed, and in July an internal BBC review determined it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster commented: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in full. We will adhere to the directive as soon as the timing and language are confirmed."
