The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the child of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the broadcaster to air a evening declaration about its conclusions.
"As this represents a significant violation of our code, we are directing the corporation to transmit a statement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the regulator stated.
'Potential to Damage Confidence'
The watchdog's report said: "Our probe found that the documentary's failure to disclose that the narrator's male guardian served in a post in the Hamas-controlled authority was materially misleading.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he shared.
"Trust is at the center of the relationship between a media organization and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to damage the exceptionally strong levels of confidence that audiences would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the online platform in last February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment found it violated the organization's editorial guidelines on factual correctness.
A BBC spokesperson said: "The authority's determination is in agreement with the results of the internal assessment, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in complete. We will adhere to the directive as soon as the timing and wording are confirmed."
