The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
The regulator has ordered the broadcaster to broadcast a prime-time declaration about its decisions.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to air a statement of our findings against it on the BBC's second channel at 21:00, with a timing to be finalised," the regulator stated.
'Potential to Erode Trust'
The watchdog's announcement declared: "The inquiry we conducted concluded that the documentary's omission to reveal that the narrator's father served in a post in the Hamas-administered authority was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their judgment of the narrator and the information he shared.
"Credibility is at the center of the connection between a television network and its viewers, notably for a public service broadcaster such as the BBC.
"This error had the possibility to undermine the very considerable levels of trust that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's familial connections emerged, and in this past July an corporation's own inquiry found it infringed the organization's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will follow the penalty as soon as the date and language are determined."
