The public service broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the voice of a film about Gaza was the son of a Hamas official, according to regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
The authority has instructed the corporation to air a peak-time announcement about its conclusions.
"Since this amounts to a serious breach of our code, we are instructing the corporation to transmit a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Risk to Undermine Trust'
The regulator's statement stated: "Our investigation determined that the programme's lack of disclosure that the voice's parent served in a position in the Hamas-run administration was significantly deceptive.
"It meant that the public did not have critical information which may have been extremely pertinent to their judgment of the presenter and the information he presented.
"Credibility is at the center of the relationship between a media organization and its public, notably for a public service broadcaster such as the public broadcaster.
"This failing had the potential to erode the exceptionally strong levels of trust that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was pulled from the online platform in last February after the narrator's personal associations came to light, and in July an internal BBC review concluded it infringed the organization's editorial guidelines on accuracy.
A corporation official said: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will comply with the directive as soon as the timing and wording are confirmed."
