The British broadcaster engaged in a "major breach" of industry standards by not revealing that the narrator of a programme about the Gaza conflict was the son of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to transmit a prime-time announcement about its findings.
"Since this amounts to a significant violation of our rules, we are instructing the corporation to air a announcement of our findings against it on BBC2 at 9pm, with a date to be determined," the statement read.
'Possibility to Undermine Confidence'
The watchdog's statement declared: "The inquiry we conducted determined that the film's omission to reveal that the presenter's parent occupied a role in the Hamas-run administration was significantly deceptive.
"It meant that the public did not have vital facts which may have been very significant to their evaluation of the voice and the details he provided.
"Trust is at the core of the connection between a broadcaster and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the exceptionally strong levels of trust that the public would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment concluded it infringed the organization's editorial guidelines on accuracy.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will comply with the directive as soon as the date and language are finalised."
