The BBC committed a "major breach" of media regulations by failing to disclose that the voice of a film about the Gaza situation was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to truthfulness".
The regulator has ordered the corporation to air a prime-time declaration about its decisions.
"As this represents a significant violation of our rules, we are directing the BBC to air a message of our conclusions against it on BBC2 at 9pm, with a timing to be finalised," the statement read.
'Risk to Undermine Trust'
The authority's announcement declared: "The inquiry we conducted determined that the programme's lack of disclosure that the narrator's parent held a post in the Hamas-administered government was significantly deceptive.
"Consequently that the public did not have vital facts which may have been highly relevant to their evaluation of the narrator and the content he presented.
"Credibility is at the core of the relationship between a television network and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This error had the potential to damage the very considerable amounts of confidence that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the online platform in the month of February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will comply with the penalty as soon as the date and wording are determined."
