The BBC was found to have committed a "major breach" of media regulations by not revealing that the presenter of a programme about Gaza was the offspring of a Hamas official, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has instructed the broadcaster to air a evening announcement about its decisions.
"As this represents a significant violation of our code, we are instructing the broadcaster to broadcast a statement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," it said.
'Possibility to Damage Confidence'
The authority's statement said: "Our investigation concluded that the programme's failure to disclose that the voice's male guardian served in a post in the Hamas-run government was significantly deceptive.
"Consequently that the public did not have essential details which may have been highly relevant to their evaluation of the presenter and the information he presented.
"Trust is at the center of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to erode the exceptionally strong levels of trust that the public would have placed in a BBC factual programme about the Gaza conflict."
The film was removed from the online platform in last February after the narrator's familial connections were revealed, and in the month of July an internal BBC review found it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official commented: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will comply with the directive as soon as the date and language are confirmed."
