The BBC was found to have committed a "serious breach" of broadcasting rules by not revealing that the narrator of a film about the Gaza situation was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to factual correctness".
The regulator has instructed the corporation to transmit a peak-time declaration about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the corporation to broadcast a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Potential to Damage Credibility'
The regulator's report stated: "Our investigation found that the programme's lack of disclosure that the voice's father occupied a position in the Hamas-administered authority was materially misleading.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the content he shared.
"Credibility is at the core of the relationship between a broadcaster and its viewers, notably for a public service broadcaster such as the BBC.
"This failing had the risk to undermine the exceptionally strong amounts of trust that the public would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was pulled from the online platform in February after the narrator's family links emerged, and in the month of July an internal BBC review found it infringed the corporation's editorial guidelines on accuracy.
A corporation official stated: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and language are determined."
