The BBC was found to have committed a "serious breach" of industry standards by not revealing that the voice of a documentary about the Gaza conflict was the child of a Hamas representative, according to UK media regulator Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has instructed the corporation to broadcast a prime-time announcement about its findings.
"Given this constitutes a major infringement of our rules, we are ordering the broadcaster to air a statement of our findings against it on BBC Two at 21:00, with a schedule to be confirmed," the statement read.
'Possibility to Damage Confidence'
The watchdog's announcement stated: "Our probe concluded that the programme's omission to reveal that the voice's male guardian occupied a role in the Hamas-administered authority was materially misleading.
"Consequently that the audience did not have critical information which may have been very significant to their evaluation of the presenter and the information he shared.
"Credibility is at the heart of the relationship between a television network and its viewers, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the very considerable amounts of trust that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from iPlayer in February after the narrator's personal associations emerged, and in the month of July an broadcaster's internal assessment concluded it breached the broadcaster's editorial guidelines on truthfulness.
A corporation official stated: "The authority's determination is in accordance with the results of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in complete. We will adhere to the sanction as soon as the timing and wording are determined."