The BBC was found to have committed a "serious breach" of industry standards by failing to disclose that the presenter of a documentary about the Gaza conflict was the son of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to transmit a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to air a announcement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the statement read.
'Risk to Erode Trust'
The watchdog's report said: "The inquiry we conducted found that the programme's failure to disclose that the presenter's parent served in a role in the Hamas-controlled government was substantially inaccurate.
"This implied that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to damage the exceptionally strong amounts of credibility that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in last February after the narrator's personal associations came to light, and in the month of July an internal BBC review determined it violated the broadcaster's content policies on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in complete. We will comply with the penalty as soon as the date and language are confirmed."
