The British broadcaster committed a "serious breach" of broadcasting rules by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to air a evening declaration about its findings.
"Given this constitutes a major infringement of our code, we are instructing the corporation to broadcast a message of our determinations against it on BBC Two at 9pm, with a timing to be finalised," the statement read.
'Possibility to Erode Trust'
The authority's statement said: "Our probe found that the documentary's lack of disclosure that the presenter's parent occupied a post in the Hamas-run administration was significantly deceptive.
"This implied that the audience did not have vital facts which may have been highly relevant to their judgment of the narrator and the information he provided.
"Credibility is at the center of the connection between a broadcaster and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the possibility to undermine the exceptionally strong degrees of credibility that audiences would have invested in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in February after the narrator's personal associations emerged, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's editorial guidelines on accuracy.
A representative for the broadcaster said: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the directive as soon as the schedule and wording are determined."
