The British broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the narrator of a documentary about Gaza was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to factual correctness".
The authority has instructed the corporation to air a peak-time declaration about its findings.
"Since this amounts to a major infringement of our regulations, we are directing the corporation to air a message of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Possibility to Damage Confidence'
The authority's announcement declared: "Our investigation found that the documentary's lack of disclosure that the presenter's male guardian served in a post in the Hamas-controlled authority was significantly deceptive.
"This implied that the audience did not have essential details which may have been highly relevant to their evaluation of the voice and the details he presented.
"Trust is at the core of the bond between a television network and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the potential to damage the significantly high levels of credibility that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the online platform in the month of February after the narrator's family links were revealed, and in the month of July an broadcaster's internal assessment concluded it infringed the organization'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 film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the penalty as soon as the timing and wording are finalised."
