The public service broadcaster was found to have committed a "significant breach" of industry standards by not revealing that the voice of a documentary about the Gaza conflict was the child of a Hamas official, according to UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The regulator has directed the broadcaster to broadcast a peak-time declaration about its findings.
"As this represents a major infringement of our rules, we are directing the corporation to air a message of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be determined," the statement read.
'Potential to Undermine Credibility'
The watchdog's announcement declared: "Our investigation concluded that the programme's lack of disclosure that the narrator's male guardian served in a position in the Hamas-controlled government was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their judgment of the narrator and the information he shared.
"Trust is at the core of the relationship between a media organization and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to undermine the very considerable amounts of trust that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from the online platform in last February after the narrator's family links came to light, and in the month of July an corporation's own inquiry determined it breached the organization's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."
