The BBC was found to have committed a "major breach" of media regulations by failing to disclose that the narrator of a film about the Gaza conflict was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to air a evening declaration about its findings.
"Since this amounts to a significant violation of our regulations, we are directing the broadcaster to transmit a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the regulator stated.
'Risk to Erode Credibility'
The authority's statement declared: "Our probe determined that the film's lack of disclosure that the narrator's male guardian held a role in the Hamas-controlled authority was materially misleading.
"Consequently that the audience did not have vital facts which may have been highly relevant to their evaluation of the narrator and the details he presented.
"Confidence is at the center of the bond between a media organization and its audience, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to erode the very considerable levels of trust that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in the month of February after the presenter's family links emerged, and in this past July an internal BBC review concluded it breached the broadcaster's journalistic standards on accuracy.
A corporation official commented: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in full. We will follow the penalty as soon as the timing and wording are confirmed."
