The BBC was found to have committed a "significant breach" of media regulations by failing to disclose that the narrator of a film about Gaza was the child of a Hamas representative, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to truthfulness".
The authority has ordered the corporation to broadcast a prime-time declaration about its decisions.
"Since this amounts to a serious breach of our code, we are instructing the BBC to broadcast a announcement of our findings against it on BBC Two at 21:00, with a timing to be determined," the statement read.
'Possibility to Damage Confidence'
The watchdog's report stated: "Our investigation found that the film's failure to disclose that the voice's male guardian occupied a role in the Hamas-controlled authority was substantially inaccurate.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the presenter and the content he presented.
"Credibility is at the center of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the significantly high degrees of credibility that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in the month of February after the narrator's familial connections came to light, and in July an internal BBC review concluded it breached the organization's journalistic standards on factual correctness.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in complete. We will follow the directive as soon as the timing and wording are finalised."
