The British broadcaster committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza conflict was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The authority has instructed the BBC to air a peak-time statement about its conclusions.
"Given this constitutes a serious breach of our code, we are directing the broadcaster to transmit a statement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Undermine Confidence'
The authority's report said: "Our probe determined that the film's failure to disclose that the narrator's father occupied a post in the Hamas-controlled authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the voice and the details he shared.
"Trust is at the core of the relationship between a media organization and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to undermine the exceptionally strong levels of credibility that viewers would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in last February after the narrator's personal associations came to light, and in July an corporation's own inquiry found it violated the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The authority's determination is in line 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 accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in complete. We will follow the sanction as soon as the date and language are confirmed."
