The BBC was found to have committed a "major breach" of media regulations by omitting to mention that the voice of a documentary about Gaza was the child of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has instructed the BBC to broadcast a peak-time statement about its conclusions.
"As this represents a serious breach of our rules, we are ordering the corporation to air a message of our conclusions against it on the BBC's second channel at 9pm, with a date to be confirmed," the statement read.
'Risk to Erode Confidence'
The authority's statement said: "Our probe determined that the documentary's failure to disclose that the presenter's father served in a post in the Hamas-controlled administration was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the content he provided.
"Credibility is at the core of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to damage the significantly high degrees of confidence that the public would have put in a BBC factual programme about the Israel-Gaza war."
The film was removed from iPlayer in last February after the narrator's familial connections emerged, and in the month of July an internal BBC review determined it breached the organization's journalistic standards on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in full. We will adhere to the directive as soon as the date and language are determined."
