The BBC engaged in a "major breach" of media regulations by failing to disclose that the narrator of a film about Gaza was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to truthfulness".
The regulator has ordered the broadcaster to transmit a prime-time statement about its findings.
"Since this amounts to a serious breach of our code, we are instructing the corporation to broadcast a message of our conclusions against it on BBC2 at 21:00, with a timing to be determined," it said.
'Risk to Undermine Confidence'
The regulator's announcement stated: "Our investigation concluded that the film's lack of disclosure that the voice's parent held a post in the Hamas-administered government was materially misleading.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their judgment of the voice and the information he shared.
"Credibility is at the heart of the relationship between a media organization and its viewers, especially for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to erode the exceptionally strong amounts of credibility that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from the online platform in last February after the narrator's personal associations were revealed, and in the month of July an corporation's own inquiry found it infringed the organization's editorial guidelines on truthfulness.
A corporation official stated: "The authority's determination is in accordance with the findings of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in complete. We will follow the sanction as soon as the schedule and wording are determined."
