The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the child of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the corporation to transmit a peak-time statement about its conclusions.
"As this represents a significant violation of our regulations, we are instructing the BBC to transmit a message of our determinations against it on BBC2 at 21:00, with a date to be finalised," the statement read.
'Risk to Undermine Trust'
The authority's statement declared: "Our probe found that the film's failure to disclose that the voice's parent served in a role in the Hamas-run government was materially misleading.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the details he provided.
"Confidence is at the heart of the connection between a television network and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This error had the risk to undermine the exceptionally strong amounts of credibility that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in February after the boy's personal associations came to light, and in July an broadcaster's internal assessment found it breached the organization's content policies on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the authority's determination in complete. We will follow the penalty as soon as the date and language are finalised."
