The public service broadcaster engaged in a "serious breach" of broadcasting rules by failing to disclose that the narrator of a documentary about the Gaza situation was the child of a Hamas representative, as determined by regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The authority has ordered the broadcaster to transmit a peak-time announcement about its decisions.
"Since this amounts to a significant violation of our code, we are ordering the corporation to transmit a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the regulator stated.
'Potential to Damage Confidence'
The watchdog's announcement said: "The inquiry we conducted determined that the programme's failure to disclose that the narrator's parent served in a role in the Hamas-administered administration was substantially inaccurate.
"It meant that the public did not have critical information which may have been highly relevant to their evaluation of the voice and the content he shared.
"Trust is at the center of the bond between a broadcaster and its audience, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to erode the very considerable degrees of confidence that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the narrator's family links came to light, and in the month of July an broadcaster's internal assessment found it infringed the organization's editorial guidelines on accuracy.
A corporation official said: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the schedule and wording are determined."
