The public service broadcaster was found to have committed a "major breach" of media regulations by not revealing that the voice of a programme about Gaza was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to broadcast a prime-time announcement about its findings.
"Since this amounts to a serious breach of our code, we are ordering the BBC to transmit a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," the statement read.
'Risk to Undermine Trust'
The regulator's statement stated: "The inquiry we conducted found that the film's lack of disclosure that the narrator's male guardian held a position in the Hamas-run authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their evaluation of the voice and the content he provided.
"Trust is at the heart of the bond between a television network and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the very considerable amounts of trust that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the online platform in February after the presenter's personal associations emerged, and in this past July an broadcaster's internal assessment determined it infringed the organization's journalistic standards on factual correctness.
A corporation official commented: "The authority's determination 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 accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the timing and wording are determined."
