The BBC was found to have committed a "major breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a significant failing in relation to factual correctness".
The authority has directed the broadcaster to broadcast a peak-time statement about its conclusions.
"As this represents a major infringement of our code, we are instructing the BBC to broadcast a statement of our findings against it on the BBC's second channel at 21:00, with a schedule to be determined," the regulator stated.
'Risk to Damage Trust'
The regulator's announcement said: "Our investigation concluded that the film's lack of disclosure that the narrator's male guardian served in a post in the Hamas-controlled authority was significantly deceptive.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the voice and the content he shared.
"Confidence is at the core of the relationship between a television network and its public, notably for a public service broadcaster such as the public broadcaster.
"This failing had the risk to erode the exceptionally strong levels of credibility that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from iPlayer in last February after the presenter's family links were revealed, and in July an broadcaster's internal assessment concluded it infringed the organization's content policies on accuracy.
A corporation official commented: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the directive as soon as the date and wording are confirmed."
