The British broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the voice of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
The authority has ordered the BBC to transmit a prime-time declaration about its findings.
"As this represents a significant violation of our code, we are ordering the corporation to broadcast a message of our conclusions against it on the BBC's second channel at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Undermine Confidence'
The regulator's report said: "Our probe determined that the programme's omission to reveal that the narrator's parent served in a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the audience did not have critical information which may have been highly relevant to their evaluation of the voice and the information he shared.
"Trust is at the heart of the relationship between a broadcaster and its public, notably for a state-funded media outlet such as the BBC.
"This error had the risk to undermine the significantly high levels of trust that audiences would have put in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the online platform in last February after the narrator's family links emerged, and in July an internal BBC review determined it infringed the broadcaster's content policies on truthfulness.
A representative for the broadcaster said: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in its entirety. We will adhere to the directive as soon as the schedule and wording are finalised."
