The public service broadcaster was found to have committed a "significant breach" of industry standards by omitting to mention that the presenter of a film about the Gaza situation was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
The regulator has directed the broadcaster to air a prime-time announcement about its findings.
"As this represents a major infringement of our rules, we are directing the broadcaster to air a message of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be determined," it said.
'Risk to Undermine Confidence'
The watchdog's report said: "Our probe found that the film's failure to disclose that the narrator's father occupied a position in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their judgment of the voice and the information he provided.
"Trust is at the heart of the relationship between a media organization and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to damage the significantly high amounts of confidence that the public would have put in a factual film from the broadcaster about the Gaza conflict."
The film was removed from iPlayer in last February after the narrator's familial connections emerged, and in July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will comply with the sanction as soon as the timing and wording are confirmed."
