The BBC engaged in a "significant breach" of industry standards by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
The authority has instructed the corporation to broadcast a peak-time declaration about its conclusions.
"As this represents a serious breach of our regulations, we are ordering the BBC to transmit a announcement of our conclusions against it on the BBC's second channel at 9pm, with a date to be finalised," the regulator stated.
'Potential to Erode Credibility'
The regulator's announcement declared: "Our investigation determined that the film's lack of disclosure that the voice's male guardian served in a post in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been highly relevant to their evaluation of the narrator and the content he provided.
"Credibility is at the core of the connection between a television network and its public, especially for a public service broadcaster such as the public broadcaster.
"This error had the possibility to damage the exceptionally strong degrees of credibility that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from iPlayer in February after the narrator's family links came to light, and in the month of July an internal BBC review determined it breached the corporation's editorial guidelines on accuracy.
A corporation official said: "The authority's determination is in line with the results of the corporation's inquiry, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in full. We will follow the sanction as soon as the timing and wording are finalised."
