The British broadcaster committed a "significant breach" of industry standards by failing to disclose that the narrator of a documentary about the Gaza conflict was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to transmit a evening announcement about its findings.
"Given this constitutes a major infringement of our code, we are instructing the BBC to transmit a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," the regulator stated.
'Risk to Undermine Credibility'
The watchdog's announcement declared: "Our probe concluded that the programme's lack of disclosure that the presenter's male guardian occupied a role in the Hamas-administered administration was substantially inaccurate.
"It meant that the public did not have essential details which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Confidence is at the core of the bond between a media organization and its viewers, especially for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the significantly high degrees of confidence that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in last February after the presenter's family links came to light, and in the month of July an internal BBC review concluded it violated the broadcaster's editorial guidelines on accuracy.
A corporation official said: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the sanction as soon as the timing and wording are confirmed."
