The British broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
The regulator has ordered the corporation to transmit a prime-time announcement about its decisions.
"Since this amounts to a major infringement of our code, we are instructing the corporation to broadcast a statement of our findings against it on BBC2 at 21:00, with a schedule to be confirmed," it said.
'Potential to Undermine Confidence'
The authority's report declared: "Our investigation concluded that the documentary's omission to reveal that the narrator's male guardian held a position in the Hamas-run authority was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been very significant to their evaluation of the narrator and the information he presented.
"Credibility is at the center of the relationship between a television network and its audience, notably for a national broadcasting corporation such as the BBC.
"This oversight had the risk to erode the exceptionally strong amounts of confidence that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the online platform in February after the narrator's family links came to light, and in July an broadcaster's internal assessment concluded it infringed the broadcaster's editorial guidelines on factual correctness.
A corporation official commented: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in complete. We will adhere to the sanction as soon as the schedule and wording are determined."
