The public service broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the voice of a film about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to accuracy".
Ofcom has directed the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a major infringement of our regulations, we are ordering the broadcaster to air a statement of our determinations against it on BBC Two at 21:00, with a timing to be determined," the statement read.
'Potential to Erode Trust'
The authority's report said: "The inquiry we conducted found that the film's lack of disclosure that the narrator's parent occupied a position in the Hamas-administered administration was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been highly relevant to their evaluation of the voice and the content he shared.
"Trust is at the center of the relationship between a media organization and its public, notably for a public service broadcaster such as the public broadcaster.
"This failing had the potential to erode the significantly high degrees of confidence that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the narrator's family links were revealed, and in this past July an internal BBC review concluded it violated the organization's content policies on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the results of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in full. We will follow the penalty as soon as the date and wording are finalised."
