The BBC engaged in a "major breach" of broadcasting rules by not revealing that the presenter of a documentary about the Gaza situation was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has ordered the corporation to air a peak-time declaration about its decisions.
"As this represents a significant violation of our rules, we are directing the corporation to air a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Potential to Erode Credibility'
The regulator's report declared: "Our probe found that the documentary's failure to disclose that the voice's father occupied a position in the Hamas-administered administration was significantly deceptive.
"Consequently that the public did not have essential details which may have been extremely pertinent to their assessment of the narrator and the details he provided.
"Credibility is at the center of the connection between a broadcaster and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to erode the exceptionally strong amounts of credibility that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The film was pulled from the BBC's streaming service in February after the boy's family links came to light, and in this past July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the authority's determination in full. We will follow the sanction as soon as the date and language are determined."
