The BBC was found to have committed a "serious breach" of media regulations by not revealing that the narrator of a documentary about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The authority has ordered the BBC to broadcast a prime-time statement about its findings.
"Since this amounts to a serious breach of our code, we are instructing the BBC to broadcast a statement of our findings against it on BBC Two at 9pm, with a schedule to be determined," the regulator stated.
'Possibility to Erode Confidence'
The authority's report said: "Our investigation found that the documentary's lack of disclosure that the narrator's father held a role in the Hamas-administered authority was materially misleading.
"This implied that the audience did not have vital facts which may have been highly relevant to their evaluation of the voice and the content he provided.
"Confidence is at the core of the connection between a television network and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to erode the exceptionally strong amounts of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was removed from the online platform in February after the boy's family links came to light, and in this past July an corporation's own inquiry concluded it infringed the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson commented: "The authority's determination is in line with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in its entirety. We will follow the directive as soon as the date and language are confirmed."
