The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the narrator of a film about Gaza was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
The authority has directed the BBC to air a prime-time declaration about its decisions.
"Since this amounts to a major infringement of our code, we are ordering the BBC to broadcast a statement of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be determined," the statement read.
'Risk to Undermine Credibility'
The watchdog's announcement declared: "Our investigation concluded that the film's omission to reveal that the narrator's parent occupied a position in the Hamas-run authority was materially misleading.
"This implied that the public did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Credibility is at the core of the bond between a broadcaster and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to damage the exceptionally strong levels of credibility that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from the online platform in last February after the narrator's personal associations emerged, and in the month of July an corporation's own inquiry concluded it breached the organization's editorial guidelines on truthfulness.
A BBC spokesperson commented: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will follow the directive as soon as the date and language are confirmed."