The public service broadcaster engaged in a "major breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza situation was the son of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
The authority has instructed the BBC to broadcast a prime-time declaration about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the BBC to air a message of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Potential to Damage Confidence'
The watchdog's statement said: "Our probe determined that the film's lack of disclosure that the voice's male guardian served in a post in the Hamas-run administration was substantially inaccurate.
"This implied that the public did not have critical information which may have been highly relevant to their evaluation of the narrator and the details he presented.
"Confidence is at the heart of the connection between a television network and its viewers, particularly for a state-funded media outlet such as the BBC.
"This error had the potential to undermine the exceptionally strong amounts of credibility that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from the online platform in last February after the narrator's family links came to light, and in July an corporation's own inquiry found it breached the corporation's journalistic standards on factual correctness.
A corporation official stated: "The authority's determination is in accordance with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will adhere to the directive as soon as the date and language are confirmed."
