The British broadcaster engaged in a "major breach" of media regulations by omitting to mention that the voice of a film about the Gaza conflict was the child of a Hamas representative, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a prime-time announcement about its conclusions.
"As this represents a significant violation of our regulations, we are ordering the BBC to transmit a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Risk to Damage Trust'
The regulator's statement stated: "Our probe concluded that the film's failure to disclose that the narrator's parent occupied a role in the Hamas-controlled administration was significantly deceptive.
"Consequently that the audience did not have essential details which may have been highly relevant to their assessment of the presenter and the details he presented.
"Trust is at the core of the bond between a television network and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the significantly high amounts of trust that the public would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was removed from the BBC's streaming service in the month of February after the presenter's familial connections were revealed, and in July an internal BBC review found it breached the organization's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in its entirety. We will comply with the sanction as soon as the timing and wording are confirmed."
