The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the narrator of a documentary about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a significant failing in relation to truthfulness".
The authority has instructed the corporation to transmit a evening announcement about its conclusions.
"As this represents a significant violation of our rules, we are ordering the corporation to transmit a statement of our findings against it on BBC Two at 21:00, with a schedule to be determined," the statement read.
'Potential to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the programme's lack of disclosure that the narrator's father occupied a role in the Hamas-administered authority was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their judgment of the presenter and the content he provided.
"Confidence is at the heart of the relationship between a television network and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to damage the very considerable degrees of credibility that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in the month of February after the presenter's family links were revealed, and in this past July an internal BBC review concluded it violated the organization's content policies on accuracy.
A BBC spokesperson said: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the schedule and wording are finalised."
