The British broadcaster engaged in a "serious breach" of broadcasting rules by failing to disclose that the presenter of a film about the Gaza conflict was the offspring of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to transmit a prime-time statement about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to broadcast a message of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be confirmed," the statement read.
'Risk to Damage Credibility'
The watchdog's report declared: "Our probe determined that the film's failure to disclose that the voice's father occupied a post in the Hamas-administered government was materially misleading.
"It meant that the audience did not have essential details which may have been highly relevant to their judgment of the voice and the content he shared.
"Credibility is at the heart of the relationship between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the possibility to undermine the very considerable degrees of confidence that the public would have put in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the online platform in February after the narrator's personal associations came to light, and in July an corporation's own inquiry determined it infringed the broadcaster's content policies on accuracy.
A BBC spokesperson stated: "The regulator's decision is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will follow the sanction as soon as the schedule and wording are confirmed."
