The BBC engaged in a "serious breach" of industry standards by not revealing that the voice of a documentary about the Gaza situation was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
The regulator has instructed the corporation to broadcast a peak-time declaration about its findings.
"As this represents a serious breach of our code, we are directing the broadcaster to air a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be confirmed," the statement read.
'Potential to Damage Credibility'
The authority's statement stated: "The inquiry we conducted concluded that the programme's lack of disclosure that the narrator's male guardian served in a post in the Hamas-run administration was materially misleading.
"Consequently that the public did not have critical information which may have been very significant to their evaluation of the presenter and the details he shared.
"Confidence is at the core of the relationship between a broadcaster and its audience, notably for a national broadcasting corporation such as the BBC.
"This oversight had the potential to erode the significantly high levels of credibility that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from the online platform in the month of February after the presenter's personal associations were revealed, and in the month of July an corporation's own inquiry determined it infringed the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson stated: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in full. We will follow the directive as soon as the date and wording are determined."
