The BBC engaged in a "significant breach" of industry standards by not revealing that the voice of a film about the Gaza conflict was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to factual correctness".
The regulator has ordered the corporation to air a prime-time statement about its findings.
"Since this amounts to a significant violation of our code, we are ordering the broadcaster to air a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Risk to Erode Credibility'
The regulator's announcement declared: "Our probe concluded that the documentary's failure to disclose that the presenter's male guardian occupied a role in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the presenter and the content he shared.
"Credibility is at the center of the bond between a media organization and its public, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the potential to damage the very considerable degrees of confidence that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in the month of February after the presenter's familial connections emerged, and in the month of July an corporation's own inquiry concluded it breached the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in line 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 truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will comply with the penalty as soon as the timing and language are determined."
