The British broadcaster committed a "major breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
The regulator has ordered the corporation to transmit a evening announcement about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the broadcaster to transmit a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Risk to Undermine Confidence'
The watchdog's statement stated: "Our investigation found that the programme's lack of disclosure that the voice's parent held a post in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the presenter and the details he shared.
"Trust is at the heart of the relationship between a broadcaster and its public, notably for a state-funded media outlet such as the BBC.
"This error had the possibility to erode the significantly high degrees of credibility that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was withdrawn from iPlayer in February after the narrator's family links emerged, and in July an corporation's own inquiry concluded it infringed the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are confirmed."