The BBC engaged in a "serious breach" of media regulations by omitting to mention that the narrator of a documentary about Gaza was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
The authority has directed the BBC to transmit a evening announcement about its findings.
"As this represents a major infringement of our regulations, we are ordering the corporation to broadcast a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Undermine Trust'
The watchdog's report said: "Our probe concluded that the programme's failure to disclose that the voice's male guardian occupied a position in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the information he presented.
"Credibility is at the heart of the connection between a television network and its audience, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to undermine the very considerable amounts of trust that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from iPlayer in February after the narrator's personal associations came to light, and in this past July an corporation's own inquiry concluded it breached the organization's editorial guidelines on accuracy.
A BBC spokesperson said: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in complete. We will follow the directive as soon as the date and wording are finalised."
