The public service broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a film about Gaza was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to accuracy".
The authority has ordered the BBC to broadcast a prime-time declaration about its findings.
"Since this amounts to a major infringement of our code, we are directing the broadcaster to air a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be determined," the statement read.
'Potential to Erode Credibility'
The watchdog's announcement said: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's parent held a post in the Hamas-controlled administration was materially misleading.
"This implied that the public did not have critical information which may have been highly relevant to their judgment of the voice and the content he shared.
"Credibility is at the center of the bond between a broadcaster and its public, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to erode the significantly high levels of credibility that audiences would have put in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from the online platform in the month of February after the presenter's family links emerged, and in July an internal BBC review found it breached the organization's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in full. We will comply with the directive as soon as the timing and wording are determined."
