The BBC was found to have committed a "significant breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the son of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to factual correctness".
The authority has ordered the broadcaster to transmit a peak-time declaration 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 regulator stated.
'Potential to Undermine Credibility'
The authority's report stated: "Our probe concluded that the film's lack of disclosure that the narrator's parent occupied a role in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have essential details which may have been highly relevant to their judgment of the presenter and the content he provided.
"Trust is at the core of the bond between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to damage the very considerable amounts of trust that the public would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the narrator's family links emerged, and in July an corporation's own inquiry concluded it breached the organization's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will comply with the penalty as soon as the date and language are finalised."
