The British broadcaster engaged in a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza situation was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to truthfulness".
Ofcom has directed the broadcaster to transmit a peak-time declaration about its decisions.
"As this represents a serious breach of our code, we are directing the broadcaster to transmit a statement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," the statement read.
'Possibility to Damage Trust'
The authority's statement declared: "Our probe found that the film's failure to disclose that the narrator's male guardian held a post in the Hamas-run authority was materially misleading.
"It meant that the public did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the content he presented.
"Credibility is at the core of the connection between a media organization and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the potential to damage the exceptionally strong amounts of credibility that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from iPlayer in February after the narrator's familial connections emerged, and in the month of July an broadcaster's internal assessment determined it violated the organization's journalistic standards on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the date and language are finalised."
