The public service broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza conflict was the son of a Hamas official, according to regulatory body Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the corporation to air a evening announcement about its conclusions.
"As this represents a significant violation of our code, we are directing the corporation to air a announcement of our determinations against it on BBC2 at 9pm, with a schedule to be confirmed," the regulator stated.
'Potential to Undermine Trust'
The watchdog's statement stated: "Our investigation determined that the programme's omission to reveal that the narrator's male guardian occupied a position in the Hamas-administered government was significantly deceptive.
"This implied that the public did not have critical information which may have been very significant to their judgment of the voice and the content he presented.
"Trust is at the center of the bond between a broadcaster and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to undermine the very considerable degrees of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's family links were revealed, and in July an corporation's own inquiry found it breached the corporation's editorial guidelines on accuracy.
A corporation official commented: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the film in relation to the corporation's content standards on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will adhere to the directive as soon as the schedule and language are determined."
