The British broadcaster committed a "serious breach" of industry standards by failing to disclose that the narrator of a documentary about the Gaza situation was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found 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 ordered the BBC to transmit a evening announcement about its findings.
"As this represents a major infringement of our regulations, we are instructing the BBC to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a date to be determined," the statement read.
'Potential to Undermine Credibility'
The regulator's announcement said: "Our investigation determined that the film's lack of disclosure that the presenter's father held a post in the Hamas-run administration was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been highly relevant to their evaluation of the presenter and the details he presented.
"Confidence is at the core of the relationship between a broadcaster and its public, especially for a public service broadcaster such as the BBC.
"This oversight had the possibility to undermine the significantly high degrees of credibility that audiences would have placed in a BBC factual programme about the Gaza conflict."
The film was removed from the BBC's streaming service in the month of February after the presenter's family links came to light, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's content policies on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will follow the penalty as soon as the timing and wording are confirmed."
