The BBC was found to have committed a "serious breach" of media regulations by failing to disclose that the narrator of a programme about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
The regulator has ordered the BBC to transmit a evening statement about its conclusions.
"As this represents a serious breach of our regulations, we are instructing the BBC to broadcast a message of our conclusions against it on BBC Two at 9pm, with a date to be determined," the regulator stated.
'Possibility to Undermine Confidence'
The regulator's announcement said: "Our investigation concluded that the documentary's omission to reveal that the narrator's father occupied a post in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been highly relevant to their judgment of the voice and the details he shared.
"Confidence is at the core of the relationship between a media organization and its audience, particularly for a state-funded media outlet such as the BBC.
"This oversight had the possibility to undermine the significantly high degrees of confidence that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in last February after the narrator's family links emerged, and in July an internal BBC review determined it infringed the corporation's journalistic standards on truthfulness.
A corporation official stated: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in full. We will adhere to the sanction as soon as the schedule and wording are finalised."
