The BBC committed a "significant breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza conflict was the son of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to accuracy".
The regulator has instructed the broadcaster to broadcast a prime-time declaration about its conclusions.
"Given this constitutes a major infringement of our regulations, we are directing the corporation to air a statement of our determinations against it on BBC2 at 21:00, with a schedule to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The regulator's report said: "Our probe concluded that the programme's lack of disclosure that the voice's male guardian held a role in the Hamas-controlled government was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the information he shared.
"Credibility is at the heart of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to erode the significantly high levels of trust that viewers would have put in a BBC factual programme about the Israel-Gaza war."
The film was removed from iPlayer in the month of February after the narrator's familial connections emerged, and in July an corporation's own inquiry found it breached the corporation's editorial guidelines on factual correctness.
A corporation official commented: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in its entirety. We will adhere to the penalty as soon as the date and wording are determined."
