The public service broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the voice of a film about the Gaza situation was the son of a Hamas representative, according to UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to accuracy".
Ofcom has directed the BBC to broadcast a peak-time declaration about its findings.
"Given this constitutes a significant violation of our regulations, we are directing the BBC to transmit a message of our conclusions against it on the BBC's second channel at 9pm, with a date to be finalised," the statement read.
'Potential to Damage Trust'
The authority's report declared: "Our investigation found that the programme's failure to disclose that the voice's male guardian occupied a post in the Hamas-administered government was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been highly relevant to their judgment of the voice and the details he shared.
"Confidence is at the core of the bond between a broadcaster and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the significantly high degrees of trust that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the online platform in February after the narrator's personal associations were revealed, and in this past July an internal BBC review found it breached the broadcaster's editorial guidelines on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with 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 follow the sanction as soon as the date and wording are confirmed."
