The public service broadcaster engaged in a "major breach" of industry standards by failing to disclose that the narrator of a programme about Gaza was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to broadcast a evening declaration about its decisions.
"Since this amounts to a serious breach of our regulations, we are ordering the BBC to transmit a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Undermine Confidence'
The authority's statement stated: "Our investigation concluded that the film's omission to reveal that the narrator's parent held a post in the Hamas-administered government was significantly deceptive.
"This implied that the public did not have critical information which may have been very significant to their judgment of the presenter and the content he provided.
"Credibility is at the center of the relationship between a broadcaster and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable amounts of trust that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the BBC's streaming service in the month of February after the narrator's family links were revealed, and in July an broadcaster's internal assessment concluded it violated the corporation's editorial guidelines on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in complete. We will adhere to the directive as soon as the schedule and wording are finalised."
