The BBC was found to have committed a "major breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the son of a Hamas official, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has instructed the BBC to transmit a peak-time announcement about its conclusions.
"Given this constitutes a serious breach of our code, we are directing the BBC to air a message of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," the regulator stated.
'Risk to Undermine Confidence'
The authority's announcement declared: "Our probe determined that the film's omission to reveal that the voice's parent occupied a post in the Hamas-controlled government was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the details he presented.
"Credibility 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 oversight had the possibility to erode the very considerable levels of trust that audiences would have invested in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's family links came to light, and in the month of July an internal BBC review determined it violated the corporation's content policies on truthfulness.
A corporation official stated: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will comply with the directive as soon as the schedule and wording are determined."
