The British broadcaster was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza conflict was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The regulator has instructed the corporation to broadcast a peak-time statement about its findings.
"As this represents a serious breach of our rules, we are instructing the broadcaster to air a announcement of our determinations against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Potential to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's male guardian held a post in the Hamas-run government was materially misleading.
"Consequently that the public did not have vital facts which may have been highly relevant to their evaluation of the presenter and the information he shared.
"Trust is at the center of the relationship between a media organization and its audience, especially for a public service broadcaster such as the BBC.
"This failing had the risk to undermine the very considerable levels of confidence that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from iPlayer in the month of February after the narrator's family links emerged, and in July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster 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 broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in complete. We will adhere to the directive as soon as the date and language are determined."
