The British broadcaster was found to have committed a "significant breach" of media regulations by failing to disclose that the presenter of a documentary about Gaza was the child of a Hamas representative, as determined by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The regulator has instructed the corporation to air a prime-time announcement about its conclusions.
"Given this constitutes a major infringement of our code, we are directing the corporation to transmit a message of our conclusions against it on BBC2 at 21:00, with a timing to be finalised," it said.
'Possibility to Damage Confidence'
The regulator's announcement said: "Our investigation concluded that the film's failure to disclose that the presenter's father served in a role in the Hamas-controlled government was substantially inaccurate.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the voice and the details he shared.
"Trust is at the center of the bond between a broadcaster and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the potential to erode the significantly high amounts of confidence that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in February after the narrator's personal associations emerged, and in July an corporation's own inquiry concluded it breached the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the authority's determination in complete. We will follow the penalty as soon as the timing and wording are determined."
