The public service broadcaster engaged in a "significant breach" of media regulations by failing to disclose that the voice of a programme about the Gaza conflict was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to accuracy".
Ofcom has instructed the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a major infringement of our regulations, we are instructing the corporation to broadcast a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be determined," it said.
'Potential to Undermine Trust'
The regulator's announcement stated: "Our probe determined that the film's failure to disclose that the voice's parent occupied a role in the Hamas-administered authority was significantly deceptive.
"This implied that the audience did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the information he shared.
"Confidence is at the center of the bond between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the potential to damage the exceptionally strong levels of credibility that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in February after the presenter's family links came to light, and in July an internal BBC review found it infringed the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will comply with the directive as soon as the timing and wording are confirmed."
