The British broadcaster committed a "major breach" of media regulations by not revealing that the narrator of a film about Gaza was the offspring of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to truthfulness".
The authority has instructed the corporation to broadcast a evening declaration about its decisions.
"Since this amounts to a serious breach of our rules, we are directing the BBC to air a announcement of our findings against it on BBC2 at 9pm, with a timing to be finalised," it said.
'Risk to Erode Trust'
The authority's announcement said: "Our investigation determined that the programme's omission to reveal that the voice's father occupied a post in the Hamas-administered authority was materially misleading.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the details he shared.
"Trust is at the heart of the relationship between a broadcaster and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the exceptionally strong amounts of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was removed from the BBC's streaming service in the month of February after the presenter's family links emerged, and in this past July an broadcaster's internal assessment determined it violated the corporation's editorial guidelines on truthfulness.
A corporation official said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will follow the sanction as soon as the date and wording are confirmed."
