The BBC was found to have committed a "serious breach" of media regulations by not revealing that the presenter of a film about the Gaza situation was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to accuracy".
The regulator has directed the corporation to broadcast a peak-time statement about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the corporation to broadcast a announcement of our findings against it on BBC2 at 9pm, with a timing to be determined," the statement read.
'Possibility to Erode Trust'
The regulator's statement stated: "Our investigation found that the documentary's failure to disclose that the presenter's male guardian occupied a post in the Hamas-run administration was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the details he presented.
"Credibility is at the heart of the connection between a television network and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This failing had the potential to erode the significantly high amounts of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in February after the boy's familial connections came to light, and in July an broadcaster's internal assessment found it breached the corporation's editorial guidelines on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in complete. We will adhere to the penalty as soon as the date and wording are confirmed."
