The public service broadcaster committed a "significant breach" of industry standards by not revealing that the voice of a programme about Gaza was the son of a Hamas representative, according to UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
The regulator has instructed the broadcaster to air a prime-time statement about its findings.
"Given this constitutes a serious breach of our rules, we are ordering the BBC to air a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Risk to Damage Trust'
The watchdog's statement stated: "Our investigation found that the programme's omission to reveal that the narrator's male guardian held a post in the Hamas-administered administration was materially misleading.
"It meant that the audience did not have critical information which may have been very significant to their evaluation of the voice and the content he shared.
"Confidence is at the center of the bond between a television network and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the very considerable levels of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the online platform in the month of February after the narrator's personal associations emerged, and in the month of July an broadcaster's internal assessment determined it violated the corporation's editorial guidelines on truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in complete. We will adhere to the directive as soon as the schedule and wording are confirmed."
