The public service broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to accuracy".
Ofcom has directed the BBC to air a peak-time declaration about its findings.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to air a statement of our conclusions against it on the BBC's second channel at 21:00, with a schedule to be determined," the statement read.
'Potential to Undermine Confidence'
The regulator's announcement declared: "Our probe found that the programme's failure to disclose that the presenter's male guardian held a position in the Hamas-administered government was materially misleading.
"Consequently that the public did not have critical information which may have been very significant to their assessment of the voice and the details he shared.
"Confidence is at the core of the connection between a television network and its viewers, notably for a state-funded media outlet such as the BBC.
"This failing had the possibility to erode the significantly high degrees of confidence that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in February after the boy's familial connections were revealed, and in July an internal BBC review concluded it infringed the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in line with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will comply with the sanction as soon as the schedule and wording are finalised."
