The British broadcaster was found to have committed a "major breach" of media regulations by failing to disclose that the voice of a programme about Gaza was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the corporation to transmit a evening announcement about its conclusions.
"Given this constitutes a serious breach of our regulations, we are ordering the broadcaster to broadcast a message of our determinations against it on BBC Two at 21:00, with a timing to be finalised," the regulator stated.
'Potential to Damage Credibility'
The regulator's report said: "The inquiry we conducted found that the documentary's failure to disclose that the voice's male guardian held a role in the Hamas-controlled authority was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the information he shared.
"Confidence is at the heart of the relationship between a media organization and its audience, especially for a national broadcasting corporation such as the BBC.
"This oversight had the risk to damage the exceptionally strong amounts of trust that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the online platform in last February after the narrator's familial connections emerged, and in the month of July an internal BBC review found it infringed the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are determined."
