The British broadcaster was found to have committed a "major breach" of broadcasting rules by omitting to mention that the presenter of a film about Gaza was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
The regulator has ordered the corporation to broadcast a prime-time declaration about its findings.
"As this represents a major infringement of our rules, we are instructing the corporation to broadcast a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The regulator's report declared: "The inquiry we conducted concluded that the documentary's failure to disclose that the narrator's male guardian occupied a position in the Hamas-controlled government was materially misleading.
"It meant that the public did not have vital facts which may have been highly relevant to their evaluation of the narrator and the content he shared.
"Trust is at the core of the relationship between a television network and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the significantly high levels of confidence that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from iPlayer in the month of February after the narrator's family links were revealed, and in the month of July an corporation's own inquiry concluded it infringed the broadcaster's journalistic standards on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the film in relation to the corporation's content standards on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in complete. We will follow the penalty as soon as the timing and wording are determined."
