The BBC was found to have committed a "serious breach" of industry standards by failing to disclose that the narrator of a documentary about the Gaza situation was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
The authority has ordered the broadcaster to air a prime-time announcement about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the corporation to broadcast a announcement of our conclusions against it on BBC Two at nine o'clock in the evening, with a date to be determined," the statement read.
'Potential to Undermine Trust'
The watchdog's report said: "The inquiry we conducted concluded that the programme's lack of disclosure that the narrator's parent served in a role in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have vital facts which may have been very significant to their evaluation of the narrator and the content he shared.
"Trust is at the heart of the bond between a media organization and its audience, notably for a public service broadcaster such as the public broadcaster.
"This error had the possibility to damage the very considerable degrees of confidence that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The film 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 organization's journalistic standards on accuracy.
A corporation official commented: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will follow the penalty as soon as the schedule and wording are finalised."
