The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The regulator has ordered the corporation to broadcast a peak-time announcement about its decisions.
"As this represents a significant violation of our regulations, we are ordering the broadcaster to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be confirmed," the regulator stated.
'Potential to Erode Credibility'
The authority's announcement declared: "The inquiry we conducted determined that the film's failure to disclose that the narrator's parent served in a post in the Hamas-controlled authority was substantially inaccurate.
"It meant that the public did not have critical information which may have been very significant to their evaluation of the presenter and the content he presented.
"Confidence is at the center of the connection between a television network and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to erode the significantly high levels of credibility that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from iPlayer in the month of February after the presenter's personal associations emerged, and in July an internal BBC review found it violated the organization's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in full. We will comply with the penalty as soon as the timing and wording are confirmed."
