The British broadcaster committed a "significant breach" of broadcasting rules by failing to disclose that the presenter of a film about Gaza was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the corporation to transmit a peak-time announcement about its findings.
"As this represents a major infringement of our code, we are ordering the BBC to transmit a message of our determinations against it on the BBC's second channel at 9pm, with a timing to be finalised," the regulator stated.
'Possibility to Erode Trust'
The regulator's statement declared: "Our investigation found that the documentary's lack of disclosure that the presenter's father served in a post in the Hamas-administered administration was substantially inaccurate.
"Consequently that the public did not have essential details which may have been highly relevant to their evaluation of the narrator and the content he shared.
"Credibility is at the center of the relationship between a broadcaster and its viewers, particularly for a state-funded media outlet such as the BBC.
"This error had the potential to erode the very considerable levels of confidence that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in the month of 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 truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the results of Peter Johnston's review, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the directive as soon as the timing and language are finalised."
