The British broadcaster committed a "major breach" of media regulations by not revealing that the narrator of a programme about Gaza was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to truthfulness".
The authority has instructed the corporation to transmit a peak-time declaration about its decisions.
"As this represents a significant violation of our code, we are ordering the broadcaster to broadcast a announcement of our findings against it on BBC2 at 21:00, with a timing to be confirmed," the regulator stated.
The authority's announcement stated: "The inquiry we conducted concluded that the documentary's omission to reveal that the narrator's father held a post in the Hamas-run government was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the content he presented.
"Credibility is at the heart of the connection between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This oversight had the risk to undermine the significantly high amounts of credibility that audiences would have invested in a BBC factual programme about the Gaza conflict."
The programme was pulled from iPlayer in February after the presenter's family links emerged, and in this past July an broadcaster's internal assessment concluded it infringed the corporation's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in full. We will follow the directive as soon as the timing and wording are determined."
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