The public service broadcaster committed a "significant breach" of broadcasting rules by omitting to mention that the presenter of a film about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to truthfulness".
The authority has instructed the corporation to broadcast a peak-time statement about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the corporation to transmit a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Risk to Damage Credibility'
The authority's report said: "Our investigation found that the film's failure to disclose that the presenter's male guardian served in a post in the Hamas-administered authority was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been very significant to their evaluation of the narrator and the content he shared.
"Credibility is at the core of the relationship between a media organization and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to undermine the very considerable levels of confidence that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in February after the narrator's family links were revealed, and in the month of July an internal BBC review determined it breached the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in complete. We will follow the directive as soon as the date and wording are finalised."
