The BBC was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza conflict was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to accuracy".
Ofcom has directed the broadcaster to air a prime-time declaration about its findings.
"Since this amounts to a significant violation of our regulations, we are directing the corporation to broadcast a announcement of our findings against it on BBC2 at 9pm, with a schedule to be confirmed," the statement read.
'Risk to Damage Credibility'
The authority's statement declared: "The inquiry we conducted determined that the documentary's failure to disclose that the voice's male guardian held a role in the Hamas-administered authority was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been very significant to their judgment of the narrator and the details he provided.
"Credibility is at the center of the bond between a broadcaster and its audience, particularly for a public service broadcaster such as the BBC.
"This error had the potential to erode the very considerable degrees of credibility that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was withdrawn from the online platform in the month of February after the boy's family links emerged, and in this past July an internal BBC review determined it violated the broadcaster's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in full. We will adhere to the sanction as soon as the timing and wording are determined."
