The British broadcaster was found to have committed a "major breach" of industry standards by not revealing that the presenter of a documentary about the Gaza situation was the child of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the corporation to air a prime-time declaration about its findings.
"Since this amounts to a serious breach of our rules, we are instructing the corporation to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Potential to Undermine Credibility'
The authority's statement said: "The inquiry we conducted found that the programme's lack of disclosure that the narrator's father held a post in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the public did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the content he shared.
"Credibility is at the heart of the bond between a television network and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable degrees of confidence that viewers would have put in a BBC factual programme about the Gaza conflict."
The documentary was removed from the online platform in the month of February after the narrator's familial connections were revealed, and in this past July an corporation's own inquiry determined it infringed the corporation's journalistic standards on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will adhere to the sanction as soon as the timing and language are confirmed."
