The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the narrator of a programme about Gaza was the son of a Hamas official, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
The authority has directed the corporation to transmit a prime-time declaration about its findings.
"Since this amounts to a significant violation of our code, we are directing the BBC to broadcast a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be determined," the statement read.
'Potential to Undermine Trust'
The regulator's statement stated: "The inquiry we conducted concluded that the documentary's lack of disclosure that the presenter's father served in a post in the Hamas-controlled administration was materially misleading.
"Consequently that the viewers did not have essential details which may have been very significant to their judgment of the voice and the details he provided.
"Credibility is at the core of the connection between a broadcaster and its public, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the very considerable levels of trust that the public would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was removed from the online platform in February after the narrator's family links emerged, and in this past July an broadcaster's internal assessment determined it breached the corporation's content policies on truthfulness.
A corporation official stated: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will adhere to the directive as soon as the schedule and language are finalised."
