The public service broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the presenter of a film about Gaza was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
Ofcom has directed the corporation to broadcast a evening announcement about its findings.
"Given this constitutes a significant violation of our regulations, we are ordering the corporation to air a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be finalised," it said.
'Risk to Erode Confidence'
The watchdog's report said: "The inquiry we conducted found that the film's lack of disclosure that the voice's parent occupied a post in the Hamas-administered administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their evaluation of the narrator and the content he shared.
"Credibility is at the heart of the relationship between a media organization and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to erode the very considerable levels of trust that audiences would have put in a BBC factual programme about the Gaza conflict."
The film was removed from iPlayer in February after the boy's family links came to light, and in the month of July an internal BBC review concluded it breached the broadcaster's journalistic standards on truthfulness.
A corporation official said: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the date and wording are finalised."
