The public service broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the narrator of a documentary about the Gaza situation was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The regulator has directed the BBC to broadcast a evening declaration about its findings.
"Given this constitutes a significant violation of our code, we are instructing the broadcaster to transmit a message of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," it said.
'Possibility to Damage Confidence'
The watchdog's announcement said: "The inquiry we conducted determined that the documentary's omission to reveal that the voice's parent occupied a post in the Hamas-run administration was significantly deceptive.
"Consequently that the audience did not have critical information which may have been very significant to their assessment of the presenter and the details he provided.
"Credibility is at the heart of the bond between a broadcaster and its viewers, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to erode the exceptionally strong degrees of credibility that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the BBC's streaming service in last February after the presenter's personal associations were revealed, and in this past July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will comply with the sanction as soon as the timing and language are confirmed."
