The public service broadcaster committed a "significant breach" of media regulations by failing to disclose that the voice of a documentary about the Gaza conflict was the child of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
Ofcom has directed the broadcaster to transmit a peak-time statement about its conclusions.
"As this represents a significant violation of our rules, we are ordering the BBC to broadcast a announcement of our determinations against it on BBC Two at 9pm, with a timing to be determined," it said.
'Risk to Damage Trust'
The watchdog's statement said: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's parent occupied a post in the Hamas-administered administration was significantly deceptive.
"It meant that the public did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the content he provided.
"Confidence is at the heart of the connection between a broadcaster and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the possibility to erode the very considerable levels of confidence that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in February after the narrator's family links emerged, and in July an corporation's own inquiry found it breached the broadcaster's content policies on accuracy.
A BBC spokesperson said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will adhere to the sanction as soon as the schedule and language are confirmed."
