The BBC was found to have committed a "major breach" of industry standards by omitting to mention that the voice of a film about the Gaza conflict was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to transmit a prime-time declaration about its conclusions.
"As this represents a serious breach of our rules, we are instructing the broadcaster to air a message of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be confirmed," it said.
'Risk to Damage Trust'
The watchdog's statement stated: "The inquiry we conducted determined that the programme's failure to disclose that the voice's male guardian held a position in the Hamas-run authority was significantly deceptive.
"This implied that the public did not have vital facts which may have been very significant to their evaluation of the narrator and the information he presented.
"Confidence is at the heart of the bond between a television network and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the significantly high amounts of credibility that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the online platform in last February after the narrator's familial connections emerged, and in this past July an internal BBC review determined it infringed the organization's journalistic standards on factual correctness.
A representative for the broadcaster said: "The authority's determination is in agreement with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will follow the penalty as soon as the timing and wording are finalised."
