The British broadcaster engaged in a "significant breach" of industry standards by not revealing that the narrator of a film about Gaza was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a peak-time statement about its decisions.
"As this represents a major infringement of our regulations, we are instructing the corporation to air a message of our findings against it on the BBC's second channel at 9pm, with a date to be finalised," the statement read.
'Potential to Undermine Credibility'
The watchdog's announcement declared: "Our probe found that the programme's failure to disclose that the presenter's male guardian served in a post in the Hamas-controlled authority was substantially inaccurate.
"This implied that the public did not have critical information which may have been very significant to their judgment of the narrator and the content he shared.
"Trust is at the heart of the bond between a media organization and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to undermine the exceptionally strong amounts of credibility that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in the month of February after the presenter's personal associations came to light, and in July an corporation's own inquiry determined it breached the broadcaster's editorial guidelines on factual correctness.
A corporation official stated: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in complete. We will adhere to the directive as soon as the timing and wording are finalised."
