The British broadcaster committed a "major breach" of industry standards by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has directed the broadcaster to air a evening announcement about its findings.
"As this represents a major infringement of our code, we are ordering the BBC to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," the statement read.
'Potential to Undermine Trust'
The watchdog's statement declared: "Our probe determined that the programme's failure to disclose that the narrator's father served in a post in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have critical information which may have been very significant to their judgment of the narrator and the content he presented.
"Trust is at the core of the bond between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the possibility to undermine the exceptionally strong levels of credibility that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the online platform in the month of February after the narrator's familial connections came to light, and in July an broadcaster's internal assessment determined it violated the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in complete. We will adhere to the directive as soon as the date and wording are confirmed."
