The BBC was found to have committed a "significant breach" of industry standards by failing to disclose that the voice of a documentary about the Gaza situation was the child of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the broadcaster to air a evening statement about its findings.
"As this represents a significant violation of our code, we are instructing the BBC to air a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Undermine Confidence'
The authority's report declared: "Our investigation found that the programme's lack of disclosure that the narrator's parent occupied a post in the Hamas-administered authority was materially misleading.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the voice and the content he shared.
"Trust is at the center of the connection between a broadcaster and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This error had the risk to undermine the exceptionally strong levels of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the boy's family links were revealed, and in July an internal BBC review determined it infringed the broadcaster's content policies on truthfulness.
A BBC spokesperson said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the date and wording are determined."
